AARoads Forum

National Boards => Bridges => Topic started by: PAHighways on May 24, 2011, 02:10:42 PM

Title: Bridges on Bridges
Post by: PAHighways on May 24, 2011, 02:10:42 PM
Who knew actor Beau Bridges was such an expert on bridges?  Although, he really needs to double check his facts.

http://www.funnyordie.com/videos/04dae3fa8e/bridges-on-bridges-with-beau-bridges
Title: Re: Bridges on Bridges
Post by: Alps on May 24, 2011, 08:22:46 PM
I've seen bridges on bridges. For example, the elevated subway over Grand Central Parkway in NYC.
Title: Re: Bridges on Bridges
Post by: NE2 on May 24, 2011, 09:22:26 PM
I've seen tunnels in bridges (Grand Concourse subway over the Cross Bronx) and bridges in tunnels (some of the subway stations in Harlem are large caverns with bridges to cross over the tracks).
Title: Re: Bridges on Bridges
Post by: SteveG1988 on May 24, 2011, 11:54:44 PM
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.metrojacksonville.com%2Fphotos%2Fthumbs%2Flrg-3075-p1020527.jpg&hash=1a43a622710018a41652b9342095ed1da23824c6)

Richmond VA, bridge under a bridge
Title: Re: Bridges on Bridges
Post by: agentsteel53 on May 25, 2011, 12:31:02 AM
I believe it is US-2 in St. Johnsbury, VT (though it may be I-5) which features an old bridge, which was later reused as the substructure to a new bridge!
Title: Re: Bridges on Bridges
Post by: NE2 on May 25, 2011, 12:42:53 AM
They did that all along the Florida Keys, putting roadways on top of old railroad trusses.
Title: Re: Bridges on Bridges
Post by: Zmapper on May 25, 2011, 12:51:54 AM
I suppose tracks laid on top of railroad ties could be considered a type of bridge.   :hmmm:
Title: Re: Bridges on Bridges
Post by: NE2 on May 25, 2011, 01:25:24 AM
The train could be carrying students to a model bridge competition :sombrero:
Title: Re: Bridges on Bridges
Post by: SteveG1988 on May 25, 2011, 02:17:54 PM
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.floridakeystraveler.com%2Fgallery%2FBahia_Honda_Bridge.jpg&hash=0365a4fc8109a1dba3fb593b26af23e434a43c9d)
Title: Re: Bridges on Bridges
Post by: oscar on May 25, 2011, 03:36:13 PM
Quote from: SteveG1988 on May 24, 2011, 11:54:44 PM
Richmond VA, bridge under a bridge

I don't have a photo handy, but in Washington, D.C., part of the ramp from northbound S. Capitol Street to the westbound Southwest-Southeast Freeway (at that poiint unsigned I-695) is suspended from the freeway's bridge deck. 
Title: Re: Bridges on Bridges
Post by: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.
Title: Re: Bridges on Bridges
Post by: Hot Rod Hootenanny on February 07, 2012, 10:46:09 PM
This is just two miles north of my house. The original stone culvert was kept and the county built a new bridge above it.
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fa7.sphotos.ak.fbcdn.net%2Fhphotos-ak-ash4%2F419656_2841625837539_1060632505_n.jpg&hash=13d95a5f4c5df71922425a3e638178646db4cb09)
Title: Re: Bridges on Bridges
Post by: dfilpus on February 08, 2012, 12:51:45 PM
The Blue Ridge Parkway over the James River in Virginia has a pedestrian bridge underneath the roadway
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Flh5.ggpht.com%2F_wnuuDBHft8s%2FTJDGqKcgCdI%2FAAAAAAAAAJs%2F6SVYwkmSwSg%2Fs800%2FDSC02471.JPG&hash=d5a8fd2cc74ea0d07c373705ffacbdb077c70bfc)
Title: Re: Bridges on Bridges
Post by: Mr_Northside on February 08, 2012, 04:24:22 PM
http://maps.google.com/maps?q=15212&hl=en&ll=40.428688,-79.930344&spn=0.020613,0.045447&sll=37.0625,-95.677068&sspn=43.713406,93.076172&hnear=Pittsburgh,+Pennsylvania+15212&t=h&z=15&layer=c&cbll=40.428696,-79.938671&panoid=jYzdDqxlwAMHjEiz_hpdRQ&cbp=12,106.5,,0,-1.44 (http://maps.google.com/maps?q=15212&hl=en&ll=40.428688,-79.930344&spn=0.020613,0.045447&sll=37.0625,-95.677068&sspn=43.713406,93.076172&hnear=Pittsburgh,+Pennsylvania+15212&t=h&z=15&layer=c&cbll=40.428696,-79.938671&panoid=jYzdDqxlwAMHjEiz_hpdRQ&cbp=12,106.5,,0,-1.44)

The infamous "catch" bridge under the Greenfield bridge along the Parkway East.
In a couple of years this should be a thing of the past, since they're finally going to rebuild the Greenfield Bridge.
Title: Re: Bridges on Bridges
Post by: Revive 755 on February 08, 2012, 08:10:56 PM
One on I-90/94 south of I-55:
<iframe width="425" height="350" frameborder="0" scrolling="no" marginheight="0" marginwidth="0" src="http://maps.google.com/maps?hl=en&amp;ie=UTF8&amp;ll=41.786342,-87.630862&amp;spn=0.013584,0.033023&amp;t=k&amp;z=16&amp;layer=c&amp;cbll=41.786342,-87.630862&amp;panoid=sPIzC2NHLgPNGTSogmkXyQ&amp;cbp=12,357.66,,0,-6.14&amp;source=embed&amp;output=svembed"></iframe><br /><small><a href="http://maps.google.com/maps?hl=en&amp;ie=UTF8&amp;ll=41.786342,-87.630862&amp;spn=0.013584,0.033023&amp;t=k&amp;z=16&amp;layer=c&amp;cbll=41.786342,-87.630862&amp;panoid=sPIzC2NHLgPNGTSogmkXyQ&amp;cbp=12,357.66,,0,-6.14&amp;source=embed" style="color:#0000FF;text-align:left">View Larger Map</a></small> (//http://://maps.google.com/maps?hl=en&amp;ie=UTF8&amp;ll=41.786342,-87.630862&amp;spn=0.013584,0.033023&amp;t=k&amp;z=16&amp;layer=c&amp;cbll=41.786342,-87.630862&amp;panoid=sPIzC2NHLgPNGTSogmkXyQ&amp;cbp=12,357.66,,0,-6.14&amp;source=embed&amp;output=svembed"></iframe><br%20/><small><a%20href="http://maps.google.com/maps?hl=en&amp;ie=UTF8&amp;ll=41.786342,-87.630862&amp;spn=0.013584,0.033023&amp;t=k&amp;z=16&amp;layer=c&amp;cbll=41.786342,-87.630862&amp;panoid=sPIzC2NHLgPNGTSogmkXyQ&amp;cbp=12,357.66,,0,-6.14&amp;source=embed"%20style="color:#0000FF;text-align:left">View%20Larger%20Map</a></small>)
Title: Re: Bridges on Bridges
Post by: roadman65 on February 08, 2012, 08:33:56 PM
You can say that the CR 514 overpass over both the NJ Turnpike and Garden State Parkway in Woodbridge, NJ is one.  Even, though it straddles above the two freeway's crossing, there are two wrought iron piers in the median of the GSP supporting the middle of CR 514 that are on top the center retaining wall (elongated pier) of the bridge suspending the higher freeway over the Turnpike. 
Title: Re: Bridges on Bridges
Post by: Beltway on February 08, 2012, 09:25:34 PM
Quote from: SteveG1988 on May 24, 2011, 11:54:44 PM
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.metrojacksonville.com%2Fphotos%2Fthumbs%2Flrg-3075-p1020527.jpg&hash=1a43a622710018a41652b9342095ed1da23824c6)

Richmond VA, bridge under a bridge

US-1/US-301 Robert E. Lee Bridge over the James River.

The Lee Bridge is a 6-lane segmental cast-in-place post-tensioned design, opened in 1989.

The bridge underneath is a suspension design, for pedestrians and bicycles, to Belle Isle.

http://en.wikipedia.org/wiki/Belle_Isle_(Richmond,_Virginia)_

"Belle Isle is a small (54-acre (220,000 m2)) island in the James River in Richmond, Virginia in the United States. Belle Isle is owned by the city of Richmond, and has been designated a city park. It is accessible to pedestrian and bicycle traffic via a suspension footbridge that runs under the Robert E. Lee Bridge from the northern shore of the James."



Title: Re: Bridges on Bridges
Post by: ARMOURERERIC on February 08, 2012, 10:45:27 PM
Broad Street bridge in Rochester, built as a second level over an existing bridge that carried an abandoned Erie Canal over the Genessee River, later the lower canal level was used as a streetcar tunnel
Title: Re: Bridges on Bridges
Post by: MrDisco99 on February 10, 2012, 07:04:45 PM
(https://www.aaroads.com/northeast/new_jersey050/i-095_nb_exit_011_04.jpg)

How about this... Main St. over the Garden State Parkway over the New Jersey Turnpike


Quote from: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.

Wow, I just pulled that up on StreetView... I never knew that was there.  I guess I never thought about how deep the subway would have to be there.
Title: Re: Bridges on Bridges
Post by: Duke87 on February 10, 2012, 09:32:53 PM
Quote from: MrDisco99 on February 10, 2012, 07:04:45 PM
Quote from: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.

Wow, I just pulled that up on StreetView... I never knew that was there.  I guess I never thought about how deep the subway would have to be there.

Also noteworthy because there is an exit onto 174th... so, counter-logical as it may seem, one can get off of an underground subway and go down to get to street level.

Although, this is not the only station on the NYC subway where such a condition exists. 190th Street on the A can also make that claim, and so can Wilson Avenue on the L (sorta).
Title: Re: Bridges on Bridges
Post by: Brian556 on February 11, 2012, 06:29:27 PM
This one is on Westmoreland Rd at The Trinity River in Dallas, TX
(not my pic) Pic by local history enthusiast MC Toyer

(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi239.photobucket.com%2Falbums%2Fff121%2Fthreeforks%2F02-1.jpg&hash=4d32d58f73df1fc9edfc0c7bcd14992642b717ee)
Title: Re: Bridges on Bridges
Post by: roadman65 on February 11, 2012, 06:37:26 PM
There is one in Seattle where I-5 crosses the Ship Canal.  The reversable express lanes are located inside the bridges truss underneath the main roadway deck.
Title: Re: Bridges on Bridges
Post by: roadman65 on February 11, 2012, 06:44:02 PM
Quote from: MrDisco99 on February 10, 2012, 07:04:45 PM
(https://www.aaroads.com/northeast/new_jersey050/i-095_nb_exit_011_04.jpg)

How about this... Main St. over the Garden State Parkway over the New Jersey Turnpike


Quote from: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.

Wow, I just pulled that up on StreetView... I never knew that was there.  I guess I never thought about how deep the subway would have to be there.

You have the Connecticut Avenue Line of the Washington Metro where it has to go real deep cause Connecticut Avenue is way over 100 feet above Rock Creek Park and Parkway.  The tunnels are beneath the river and roadway beneath the high bridge.  Nonetheless, it explains why the Cross Bronx tunnels under the Grand Concourse instead of a normal bridge over the highway.
Title: Re: Bridges on Bridges
Post by: Perfxion on March 17, 2012, 02:39:55 PM
Don't know if this counts: I-10 bridge, above the frontage roads with the interchange of I-610 in the middle, with I-610 itself being the top bridge above it. BTW, one of the bridge interchange is the US290 HOV lane bridge, which currently doesn't touch I-10 or its parent road US90. US90 is cosigned on this strech of the Katy Freeway.

http://maps.google.com/maps?q=i-10+beltway+8+interchange&hl=en&safe=off&prmd=imvns&biw=1920&bih=924&um=1&ie=UTF-8&ei=3dhkT5LZAaeLsQLOxNm2Dw&sa=X&oi=mode_link&ct=mode&cd=3&ved=0CDMQ_AUoAg
Title: Re: Bridges on Bridges
Post by: roadman65 on March 18, 2012, 08:43:20 PM
Quote from: Perfxion on March 17, 2012, 02:39:55 PM
Don't know if this counts: I-10 bridge, above the frontage roads with the interchange of I-610 in the middle, with I-610 itself being the top bridge above it. BTW, one of the bridge interchange is the US290 HOV lane bridge, which currently doesn't touch I-10 or its parent road US90. US90 is cosigned on this strech of the Katy Freeway.

http://maps.google.com/maps?q=i-10+beltway+8+interchange&hl=en&safe=off&prmd=imvns&biw=1920&bih=924&um=1&ie=UTF-8&ei=3dhkT5LZAaeLsQLOxNm2Dw&sa=X&oi=mode_link&ct=mode&cd=3&ved=0CDMQ_AUoAg

The link does not work.  Its gets me to the normal google maps page showing all of North America.
Title: Re: Bridges on Bridges
Post by: DeaconG on March 19, 2012, 01:51:05 AM
Quote from: roadman65 on February 11, 2012, 06:44:02 PM
Quote from: MrDisco99 on February 10, 2012, 07:04:45 PM

Quote from: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.

Wow, I just pulled that up on StreetView... I never knew that was there.  I guess I never thought about how deep the subway would have to be there.

You have the Connecticut Avenue Line of the Washington Metro where it has to go real deep cause Connecticut Avenue is way over 100 feet above Rock Creek Park and Parkway.  The tunnels are beneath the river and roadway beneath the high bridge.  Nonetheless, it explains why the Cross Bronx tunnels under the Grand Concourse instead of a normal bridge over the highway.

It would also explain SEPTA's Broad Street Line under Broad Street where it crosses over the Roosevelt Expressway.  I always had a suspicion that was the case from way back as a kid-why did they have a viaduct like that?

http://g.co/maps/jc52u
Title: Re: Bridges on Bridges
Post by: empirestate on March 19, 2012, 01:34:32 PM
Quote from: roadman65 on May 28, 2011, 09:31:57 AM
174th and 175th Streets under Grand Councourse in the Bronx has a large arched bridge in both locations with the subway dropping from the ceiling in the middle.

Then you also have Mosholu Parkway under Jerome Avenue under the #4 elevated line:
http://g.co/maps/jukev
Title: Re: Bridges on Bridges
Post by: D-Dey65 on March 19, 2012, 03:42:21 PM
Part of the Third Avenue El used to run on the Gun Hill Road bridge over the New York Central Harlem-New Haven Lines at Williams Bridge Station(Not my link, so I'm not showing it):
http://world.nycsubway.org/perl/show?40835

Title: Re: Bridges on Bridges
Post by: D-Dey65 on April 22, 2012, 09:18:05 AM
Quote from: DeaconG on March 19, 2012, 01:51:05 AM
It would also explain SEPTA's Broad Street Line under Broad Street where it crosses over the Roosevelt Expressway.  I always had a suspicion that was the case from way back as a kid-why did they have a viaduct like that?

http://g.co/maps/jc52u
Crap! If it wasn't so close to Hunting Park and Wyoming Stations, I'd say they should reroute the Broad Street Line under the Roosevelt Expressway!

Title: Re: Bridges on Bridges
Post by: NoGoodNamesAvailable on December 14, 2014, 06:37:04 PM
Quote from: Mr_Northside on February 08, 2012, 04:24:22 PM
http://maps.google.com/maps?q=15212&hl=en&ll=40.428688,-79.930344&spn=0.020613,0.045447&sll=37.0625,-95.677068&sspn=43.713406,93.076172&hnear=Pittsburgh,+Pennsylvania+15212&t=h&z=15&layer=c&cbll=40.428696,-79.938671&panoid=jYzdDqxlwAMHjEiz_hpdRQ&cbp=12,106.5,,0,-1.44 (http://maps.google.com/maps?q=15212&hl=en&ll=40.428688,-79.930344&spn=0.020613,0.045447&sll=37.0625,-95.677068&sspn=43.713406,93.076172&hnear=Pittsburgh,+Pennsylvania+15212&t=h&z=15&layer=c&cbll=40.428696,-79.938671&panoid=jYzdDqxlwAMHjEiz_hpdRQ&cbp=12,106.5,,0,-1.44)

The infamous "catch" bridge under the Greenfield bridge along the Parkway East.
In a couple of years this should be a thing of the past, since they're finally going to rebuild the Greenfield Bridge.

Off-topic, but there's a rectangular "Beware of Aggressive Drivers" sign just after the bridge (in positive-contrast Clearview, no less!)
Title: Re: Bridges on Bridges
Post by: Alex4897 on December 15, 2014, 07:45:21 AM
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fi.imgur.com%2FHyrP4Ynl.jpg&hash=3b40b84dbbb14e0cf559647cfd0284811e737bd7)

PA 43 / 88
Title: Re: Bridges on Bridges
Post by: cpzilliacus on December 25, 2014, 10:14:13 PM
Stockholm, Sweden: St. Erik's Street over the subway's Green Line (https://goo.gl/maps/tmTaF)
Title: Re: Bridges on Bridges
Post by: Pete from Boston on December 26, 2014, 09:53:34 AM
Is the topic "double-decked bridges," "two integral bridges, one over the other," or "one bridge that crosses over another bridge"?

Title: Re: Bridges on Bridges
Post by: cpzilliacus on December 26, 2014, 10:46:38 AM
Quote from: Pete from Boston on December 26, 2014, 09:53:34 AM
Is the topic "double-decked bridges," "two integral bridges, one over the other," or "one bridge that crosses over another bridge"?

Yes!
Title: Re: Bridges on Bridges
Post by: Pete from Boston on December 26, 2014, 11:45:37 AM
BU Bridge over Grand Junction railroad bridge, Boston.

There used to be an el over the roadway on the North Washington St. bridge in Boston, but now there's just a hole in its heart truss where the el used to be.
Title: Re: Bridges on Bridges
Post by: TheHighwayMan3561 on December 27, 2014, 03:46:04 AM
I-94, St. Paul

https://www.google.com/maps/@44.9589105,-93.1990455,3a,75y,300.35h,90t/data=!3m4!1e1!3m2!1soqnLiuRWpAMZ8qPv0oL0Xw!2e0
Title: Re: Bridges on Bridges
Post by: empirestate on December 27, 2014, 06:46:02 PM
Are there any cases where two roadways (or railways) cross using a conventional bridge-type structure while both are inside of a tunnel or cavern-like area?
Title: Re: Bridges on Bridges
Post by: Pete from Boston on December 27, 2014, 09:40:50 PM
The title of this thread reads like it's a TV show hosted by Todd Bridges about, well, bridges.
Title: Re: Bridges on Bridges
Post by: cl94 on December 27, 2014, 11:40:35 PM
US 20 west of Albany, NY (https://www.google.com/maps/@42.7255474,-73.9601352,3a,75y,303.47h,92.28t/data=!3m4!1e1!3m2!1s0-UEGIB85fwDRfJkuHmZkQ!2e0) has this thing, where 2 tracks of a double track railroad line swap sides directly above the highway
Title: Re: Bridges on Bridges
Post by: Bickendan on December 29, 2014, 04:15:21 PM
Steele Bridge (old US/OR 99W) -- double decked lift bridge.
Heavy rail + bicycle/pedestrian span on bottom deck, lifts independently from the top deck.
Cars + light rail and sidewalks on top deck.
Title: Re: Bridges on Bridges
Post by: Tom958 on December 29, 2014, 07:45:18 PM
The coolest one I know of is on the D1, the most important motorway in the Czech Republic. The Nazis had started building an autobahn there, then gave up during the war, but a bridge over a watercourse was completed and used for a local road. Decades later, the Communists decided to complete the motorway, but to higher standards including less-steep grades. The lay of the land was such that it made more sense to build the new motorway directly over the old one than to tear down the existing bridge.

I saw it at skyscrapercity years ago, but I'm too lazy to look for it now since the Czech roads thread has gotten really long. It was hard to see on Google, too, even when I found out exactly where to look. Maybe ChrisZwolle will see this and help out.  :wave:
Title: Re: Bridges on Bridges
Post by: Pete from Boston on December 29, 2014, 11:33:47 PM
The Sarah Mildred Long Bridge (not really that long) over the Piscataqua River between Portsmouth, N.H., and Kittery, Me., has a rail line beneath that has been a sticking point in the bridge's replacement due to its strategic importance in carrying nuclear materials (either fuel or waste) to or from the Portsmouth Naval Shipyard on the Maine side.
Title: Re: Bridges on Bridges
Post by: roadman65 on January 01, 2015, 01:05:19 PM
Near Annapolis, MD there is the ramp from SB MD 2 to EB US 50 and WB MD 450 that is built on top of US 50 bridge over MD 2 NB.  It has a pier that rests on the bridge itself where the girders for the US 50 bridge actually support the flyover above it.
https://www.google.com/maps/@39.0139009,-76.490847,3a,75y,95.25t/data=!3m4!1e1!3m2!1sH5Rj-BTsezyG_ZcVmPgzYA!2e0
https://www.google.com/maps/place/Annapolis,+MD/@39.0144504,-76.4904551,3a,75y,270h,90t/data=!3m4!1e1!3m2!1s_tEV_bF7kkeMJ_f-5spiJw!2e0!4m2!3m1!1s0x89b7f66570672fd5:0x43f854fdd3a8274b
Title: Re: Bridges on Bridges
Post by: Pete from Boston on January 22, 2015, 08:49:15 PM
Montague City Covered Bridge (http://www.loc.gov/pictures/item/ma0718/), Mass., over Connecticut River: railroad on top, road below. 

Dislodged from piers in 1936 flood and floated away, taking out the next two bridges downstream.

(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2Fb%2Fb4%2FMontague-City-Covered-Bridge.jpg&hash=aa97c8f83edf4e58085560a263531885ac906ae4)
Title: Re: Bridges on Bridges
Post by: Bruce on April 15, 2015, 02:40:28 PM
The Lakeview Boulevard overpass on I-5 goes right over a double-decked viaduct carrying southbound I-5 and the reversible express lanes, which in turn are crossing over offramps to Mercer Street.

(https://farm8.staticflickr.com/7620/16389907443_1bc9fc389d_b.jpg) (https://flic.kr/p/qYjyt6)
Lakeview Boulevard overpass from Eastlake Avenue (https://flic.kr/p/qYjyt6) by SounderBruce (https://www.flickr.com/people/70175722@N04/), on Flickr
Title: Re: Bridges on Bridges
Post by: Beltway on September 14, 2017, 12:18:34 PM
Quote from: roadman65 on February 11, 2012, 06:44:02 PM
You have the Connecticut Avenue Line of the Washington Metro where it has to go real deep cause Connecticut Avenue is way over 100 feet above Rock Creek Park and Parkway.  The tunnels are beneath the river and roadway beneath the high bridge.  Nonetheless, it explains why the Cross Bronx tunnels under the Grand Concourse instead of a normal bridge over the highway.

The Metrorail tunnels pass under the bottom of the ravine and under Rock Creek.  That means the approach tunnels have to run deeper and deeper under Connecticut Avenue as they approach the deepest point below Rock Creek.

WMATA originally planned a shallower design that would have had portals and a bridge about 30 feet above the creek.  Complaints about aesthetics caused the design to be changed to a line that passes completely under the creek.

https://ggwash.org/view/42481/the-red-line-could-have-had-amazing-views-over-rock-creek

http://ghostsofdc.org/2013/10/01/never-built-metros-bridge-rock-creek/
Title: Re: Bridges on Bridges
Post by: D-Dey65 on October 04, 2017, 03:10:36 PM
Two bridges of the IRT Pelham Line over Westchester Avenue over two different parkways;

Bronx River Parkway:
https://commons.wikimedia.org/wiki/File:IRT_Pelham_Line_over_Bronx_River_Pkwy.jpg


Hutchinson River Parkway:
https://commons.wikimedia.org/wiki/File:Hutch_Pkwy_under_the_IRT_Pelham_Line.jpg


Meanwhile, here's the IRT Jerome Avenue Line, and the street it was named for over the Cross Bronx Expressway:
https://commons.wikimedia.org/wiki/File:Mount_Eden_Av_from_CBX_vc.jpg


And Astoria Boulevard station on the BMT Astoria Line over the Grand Central Parkway:
https://commons.wikimedia.org/wiki/File:GCP_Astoria_Blvd_31st_St_BMT_jeh.JPG



Title: Re: Bridges on Bridges
Post by: sparker on October 04, 2017, 06:43:19 PM
There are two road-over-rail bridges (both through-truss types, with the rail between the trusses and the roadway sitting atop those trusses) in the CA state system; one is on CA 70 NE of Oroville across a branch of Lake Oroville; built in 1962 as part of the realignment project on that highway (then Alternate US 40) when the Oroville Dam was built, the UP (formerly WP) Feather River line is on the lower deck, and 4 lanes of CA 70 are on top.  The other is the Pit River Bridge, with the main CA-OR line of UP (formerly SP) through the trusses and I-5 on top -- 4 lanes with a K-rail separation.  The roadway originally carried 4 lanes of US 99 traffic with just a double-line down the middle; the roadway was extended circa 1974 via cantilevered side sections to allow 12-foot lanes plus the median.   
Title: Re: Bridges on Bridges
Post by: mapman1071 on October 04, 2017, 06:56:22 PM
Quote from: D-Dey65 on October 04, 2017, 03:10:36 PM
Two bridges of the IRT Pelham Line over Westchester Avenue over two different parkways;

Bronx River Parkway:
https://commons.wikimedia.org/wiki/File:IRT_Pelham_Line_over_Bronx_River_Pkwy.jpg


Hutchinson River Parkway:
https://commons.wikimedia.org/wiki/File:Hutch_Pkwy_under_the_IRT_Pelham_Line.jpg


Meanwhile, here's the IRT Jerome Avenue Line, and the street it was named for over the Cross Bronx Expressway:
https://commons.wikimedia.org/wiki/File:Mount_Eden_Av_from_CBX_vc.jpg


And Astoria Boulevard station on the BMT Astoria Line over the Grand Central Parkway:
https://commons.wikimedia.org/wiki/File:GCP_Astoria_Blvd_31st_St_BMT_jeh.JPG




How About the 3 Stacked Bridges:
Grand Central Parkway N/S @ Roosevelt Avenue E/W (Roosevelt Avenue, IRT Corona Yard Tracks, IRT #7 Main Line)

4 Bridges with 3 Stacked
Flushing Creek SW/NE @ Van Wick Expressway I-678 N/S @ Roosevelt Ave E/W
(Roosevelt Avenue, IRT Corona Yard Tracks, IRT #7 Main Line)
Title: Re: Bridges on Bridges
Post by: D-Dey65 on October 04, 2017, 09:56:15 PM
Quote from: mapman1071 on October 04, 2017, 06:56:22 PM
How About the 3 Stacked Bridges:
Grand Central Parkway N/S @ Roosevelt Avenue E/W (Roosevelt Avenue, IRT Corona Yard Tracks, IRT #7 Main Line)

4 Bridges with 3 Stacked
Flushing Creek SW/NE @ Van Wick Expressway I-678 N/S @ Roosevelt Ave E/W
(Roosevelt Avenue, IRT Corona Yard Tracks, IRT #7 Main Line)
Only one of those is over a parkway, but as bridges themselves they all qualify. I didn't find pictures for them, but I probably could've tried to swipe the Google Street View links.

FYI, the name is "Van Wyck Expressway."  ;-)




Title: Re: Bridges on Bridges
Post by: sparker on October 20, 2017, 02:20:48 AM
One of the most unusual "road-over-rail" bridges around would have to be the Steel Bridge in Portland, OR.  The lower deck hosts a double-track main line actually owned by the Port of Portland but utilized by UP, BNSF, and Amtrak; Union Station is immediately west of the bridge, which crosses the Willamette River.  The upper deck was originally part of US 99W (and later OR 99W); it now is used by traffic to and from Interstate Avenue as well as the MAX LR lines, which split just east of the bridge into the main E-W line to Gresham and the Interstate Avenue line north to the Columbia River.  What is unique about this bridge is that the lift span of the lower deck (rail only) can be raised independently of the upper deck in order to clear mid-height river traffic; both spans must be raised when exceptionally tall ships must pass.  Since UP has an independent line through a tunnel under much of North Portland, only about a third of the rail freight traffic between Portland and the Seattle area needs to use the bridge (BNSF's freight hub is across the Columbia River in Vancouver); so the "default" bridge position is with the lower deck raised and the upper deck in a "normal" state allowing auto traffic and LR to pass.  However, with the addition of Amtrak's "Cascade" regional service between Eugene, OR and Vancouver, BC, the lower bridge is lowered into a traversable position several times per day to allow the passenger trains to access Union Station; the process, complete with bells and lights, is actually fun to watch.  The Steel Bridge, like its name implies, features construction robust enough to carry several times any momentary weight load -- which is why it was selected as the northern Willamette River crossing for MAX.  Worth a look -- and there's even an excellent (albeit a bit overpriced!) restaurant a couple of blocks north inside the old Union Station building, which is still used as the main city depot.