Highways numbered 100 - which states have them, and how prominent are they?

[KCRoadFan]

This is my 100th post on the forum. I figured that to celebrate the milestone, I would incorporate the number into the topic of a thread!

Specifically, this thread is about highways numbered 100. What I would like to know is what states have such a highway, and if they do, I also want to figure out how important or prominent of a role that highway plays in the state's road network, as I would expect to be the case with a nice round number like 100.

I know of at least two states where Highway 100 is an important regional road. In Missouri, MO 100 starts off as a two-lane road east of Jefferson City and remains such as it parallels the Missouri River to the south through Hermann and Washington. However, when it reaches the St. Louis area it becomes Manchester Road, one of the principal commercial corridors through central St. Louis County (it then turns into Manchester Avenue, and then Chouteau Avenue, in the city itself). Meanwhile, in Minnesota, MN 100 is an important north-south freeway in the Twin Cities area, serving as a western bypass of downtown Minneapolis by connecting I-694 in Brooklyn Center with I-494 in Eden Prairie, going through various inner-ring west suburbs such as St. Louis Park, Golden Valley, New Hope, Crystal, and Robbinsdale.

What other states have a Highway 100, and how important or prominent are those roads within the state or the areas they serve? (Oh, and by the way - unfortunately, there is no US 100. However, if such a highway were to exist, where might it be located?)

Here's to 100 posts by me (and counting...)

[ilpt4u]

IL 100 follows the Mississippi, then Illinois Rivers from Alton at US 67 to near Havana at US 136

Western Illinois, south of Peoria and north of the Metro East, I have not spent too much time in, so not sure how prominent it is. It does cross the Illinois River 3 times

[tq-07fan]

In 2015 my dad and I drove across Tennessee Hwy 100 from Nashville to Memphis and return the next day. It was good fast two lane highway and even had a bypass around Henderson (had to look up what town it was exactly).

Jim

[webny99]

100 posts and 30 of them are new threads. That's a decent ratio.

Not in the US, but Winnipeg, MB has a beltway, known as the Perimeter Hwy, half of which is numbered 100 (the southern half) and half of which is numbered 101 (the northern half).
I guess that makes this my #1 post (see what I did there).

[Max Rockatansky]

CA 100 remains an unbuilt freeway in Santa Cruz:

https://www.gribblenation.org/2020/04/paper-highways-unbuilt-california-state.html?m=1

[JayhawkCO]

I've been on 4:

FL - Moderately important.  Relatively long and goes from the Georgia border to Flagler Beach on the Atlantic.

MN - Important.  You already detailed why.

MO - Important.  You already detailed why.

VA - Somewhat important.  Has a concurrency with I-81 (which is why I've been on it), but doesn't hit major population centers.

Chris

[KeithE4Phx]

Before interstates, and even many years after, Indianapolis, Milwaukee, and the Twin Cities had bypasses numbered State Route 100.  MN 100 still exists in the western suburbs of Minneapolis.  IN 100 was only partially completed before I-465 was built, and has been gone since the '90s.  WI 100 through north, west, and south suburban Milwaukee is still pretty much intact.

[I-55]

Maryland's 100 runs south and west of Baltimore as a freeway. Great for getting from I-70 to east of DC.

[ozarkman417]

This is my 100th post on the forum. I figured that to celebrate the milestone, I would incorporate the number into the topic of a thread!

Nice, I'm very close to 1,000.

(Oh, and by the way - unfortunately, there is no US 100. However, if such a highway were to exist, where might it be located?)

Somewhere north of US 400, to keep it in line with smaller numbers north? We don't need another one of those mistakes..

[TheHighwayMan3561]

I wouldn't call the modern MN 100 a bypass as much as a feeder route to get people between the western suburbs and downtown via I-394. They finally rebuilt the 1930s-era stretch between Excelsior Blvd and 25th St a few years ago, but before that the route between Excelsior and 394 was complete unmitigated misery every afternoon in both directions, and southbound between 394 and Excelsior still sucks now.

[ClassicHasClass]

ME 100 is pretty notable. (Everything eventually got multiplexed over it, too.)

[JayhawkCO]

I should also add, CO has a CO100, and it is not at all important.  Less than a mile feeder highway to a town no one's heard of.

Chris

[jp the roadgeek]

CT: Intra-town route entirely within the town of East Haven that connects downtown with CT 80.  Has a partial interchange with I-95

RI: Minor arterial road way out in the sticks of northwestern Providence County.  Ends abruptly at the MA border

VT: Perhaps the most famous one (and Vermont's most famous route).  Full of character.  Runs all the way from the MA border to Newport past multiple ski resorts

NY: Made famous recently by a Progressive ad.  A somewhat prominent route in Westchester County with a couple of child routes that passes through the heart of Yonkers and White Plains, then parallels several parkways and passes through several hamlets before ending in Somers

PA: A long arterial from Chester County to the Lehigh Valley that used to connect to DE 100.  Now begins at US 202 in West Chester.  Has an interchange with the PATP.  Main route in Pottstown, and has a newer bypass near Trexlertown that offers easier access to I-78, PA 309, and the Northeast Extension for traffic to and from US 222.

DE: Kind of forgotten now that it no longer connects to its PA counterpart.  A minor arterial in suburban Wilmington that now ends abruptly at the PA border

MA, NH, and NJ do not have Route 100's

[texaskdog]

I wouldn’t call the modern MN 100 a bypass as much as a feeder route to get people between the western suburbs and downtown via I-394. They finally rebuilt the 1930s-era stretch between Excelsior Blvd and 25th St a few years ago, but before that the route between Excelsior and 394 was complete unmitigated misery every afternoon in both directions, and southbound between 394 and Excelsior still sucks now.

It was once a loop too with 110 (now 62) and 120 and 96

[DJ Particle]

I wouldn't call the modern MN 100 a bypass as much as a feeder route to get people between the western suburbs and downtown via I-394. They finally rebuilt the 1930s-era stretch between Excelsior Blvd and 25th St a few years ago, but before that the route between Excelsior and 394 was complete unmitigated misery every afternoon in both directions, and southbound between 394 and Excelsior still sucks now.

It was once a loop too with 110 (now 62) and 120 and 96

I think the only part of MN-100 that was *always* freeway was that 1930s-era stretch from the railroad bridges to Glenwood (CSAH-40), with interchanges at MN-7, Mtka Blvd, Cedar Lake, US-12 (now I-394).  I think the Glenwood and 36th intersections were signalized until the 1980s.

[Rothman]

I am surprised VT 100 was only mentioned once in this thread.  It is a key tourist route.

[US 89]

Utah’s SR 100 is part of the route connecting the two largest cities in Millard County, populations 3500 and 2600...so overall, pretty insignificant.

It was originally part of a number cluster with nearby SRs 98 and 99: all three routes were created in 1935 as west desert farming spurs. 98 and the original 99 no longer exist, but 99 is now the I-15 Business Loop through Fillmore - so the cluster lives on.

[DandyDan]

IA 100 is the Cedar Rapids bypass which goes north and west of the city. It previously ended going westbound at Edgewood Road, but was extended west and south to US 30. Whenever I have been there, it's always busy.

[TheHighwayMan3561]

IA 100 is the Cedar Rapids bypass which goes north and west of the city. It previously ended going westbound at Edgewood Road, but was extended west and south to US 30. Whenever I have been there, it's always busy.

I've wondered why this isn't now US 151 instead of 151 awkwardly going around the south side on US 30.

[mgk920]

WI 100 was the beltline bypass around Milwaukee before there were freeways.  It's still there on much of its original routing.

Also, the German A100 is the inner loop freeway around the southeast (clockwise) to the northwest sides of Berlin.

Mike

[DandyDan]

IA 100 is the Cedar Rapids bypass which goes north and west of the city. It previously ended going westbound at Edgewood Road, but was extended west and south to US 30. Whenever I have been there, it's always busy.

I've wondered why this isn't now US 151 instead of 151 awkwardly going around the south side on US 30.

I wondered this myself and made a fictional highways topic out of it. US 151 would need all new construction connecting to each end of IA 100 to make it work. https://www.aaroads.com/forum/index.php?topic=25570.0

[Bickendan]

Oregon Highway 100 is signed as US 30H. Important for tourist and historic use, but even WA 14 across the river functions better as an I-84 alternate.

[formulanone]

Georgia's Route 100 spans a good deal of its extreme western corridor. It's actually quite scenic and fun to drive on in most places, since it doesn't go through too many cities/towns.

[NWI_Irish96]

IN 100 was a surface street loop around Indianapolis that was eliminated once I-465 was completed.

The three 100s I have driven on are in MI, WI and MD.

[GaryV]

M-100 (Michigan) is a relatively small regional highway.  It runs for almost 13 miles from I-96 at Grand Ledge south to Potterville. 

Given that most Michigan highways were assigned in order*, 100 was probably the next number available.

* - Following the original batch of highways designated in 1917/18 which were assigned by decreasing length.