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Longest statewide interstate segments that go through only one county

Started by KCRoadFan, September 27, 2021, 01:38:30 AM

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clong

For AL, there are 4:
1. I-459 33.5 miles all in Jefferson
2. I-165 4.8 miles all in Mobile
3. I-759 4.6 miles all in Etowah
4. I-359 2.4 miles all in Tuscaloosa

I-10 is only in 2 counties - Mobile and Baldwin for its' 67 miles in AL.
I-565 also enters 2 counties - Limestone and Madison for its' nearly 22 miles.


webny99

Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.


SkyPesos

Updated leaderboard. Also removed I-294 from the list based on the replies. New highest for Illinois is now I-270 in Madison County for 15 miles.


StateLength (mi)InterstateCounty
California15540San Bernardino
Nevada12415Clark
North Carolina68485Mecklenburg
Florida61295Duval
Ohio55270Franklin
Texas49410Bexar
Pennsylvania4690Erie
Alabama34459Jefferson
Indiana31469Allen
West Virginia2681Berkeley
Delaware2395New Castle
Georgia2024Dade
Maryland1897Anne Arundel
South Carolina18185Greenville
Kansas17235Sedgwick
Michigan17475Genesee
Missouri17470Jackson
Iowa16880Pottawatomie
New Hampshire1695Rockingham
Illinois15270Madison
New York15481Onondaga
Oregon1182Umatilla
Vermont1193Caledonia
Washington11205Clark
Minnesota10394Hennepin
Wisconsin10894Milwaukee
Connecticut6291Hartford
New Jersey4676Camden
Montana1115Silver Bow
South Dakota1190Pennington
Wyoming1180 :DLaramie
Colorado0--
New Mexico0--
Utah0--

JayhawkCO

I'll contribute a couple.

None for Alaska or North Dakota.

Hawai'i - I-H1 is 27.16 miles long in Honolulu County.
Arizona - I-15 is 29.43 miles long in Mohave County.

Chris

NWI_Irish96

Quote from: jayhawkco on September 29, 2021, 03:59:09 PM
I'll contribute a couple.

None for Alaska or North Dakota.

Hawai'i - I-H1 is 27.16 miles long in Honolulu County.
Arizona - I-15 is 29.43 miles long in Mohave County.

Chris

I'm guessing there aren't any interstates in Hawaii that aren't all in one county.
Indiana: counties 100%, highways 100%
Illinois: counties 100%, highways 61%
Michigan: counties 100%, highways 56%
Wisconsin: counties 86%, highways 23%

oscar

Quote from: cabiness42 on September 29, 2021, 04:17:30 PM
I'm guessing there aren't any interstates in Hawaii that aren't all in one county.

Right. And all of Hawaii's Interstates are entirely in Honolulu County. When Hawaii became a state, it asked for approval of an Interstate entirely in Hawaii County (which would've been longer than Interstate H-1), but that proposal was rejected.
my Hot Springs and Highways pages, with links to my roads sites:
http://www.alaskaroads.com/home.html

hotdogPi

Quote from: webny99 on September 29, 2021, 03:18:52 PM
Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.

The northern end is ambiguous. One of the two possibilities has it crossing the Hudson.
Clinched

Traveled, plus
US 13,44,50
MA 22,40,107,109,117,119,126,141,159
NH 27, 111A(E); CA 133; NY 366; GA 42, 140; FL A1A, 7; CT 32; VT 2A, 5A; PA 3, 51, 60, QC 162, 165, 263; 🇬🇧A100, A3211, A3213, A3215, A4222; 🇫🇷95 D316

Lowest untraveled number: 14
Expected lowest untraveled number tomorrow: 25

jlam

I'll do Arkansas, as I don't believe anyone else has. It seems to be I-430, where all nearly 13 miles of it are in Pulaski county.

JCinSummerfield

Quote from: SkyPesos on September 29, 2021, 03:27:18 PM
Updated leaderboard. Also removed I-294 from the list based on the replies. New highest for Illinois is now I-270 in Madison County for 15 miles.


StateLength (mi)InterstateCounty
California15540San Bernardino
Nevada12415Clark
North Carolina68485Mecklenburg
Florida61295Duval
Ohio55270Franklin
Pennsylvania4690Erie
Alabama34459Jefferson
Indiana31469Allen
West Virginia2681Berkeley
Delaware2395New Castle
Georgia2024Dade
Maryland1897Anne Arundel
South Carolina18185Greenville
Kansas17235Sedgwick
Michigan17275Genesee
Missouri17470Jackson
Iowa16880Pottawatomie
New Hampshire1695Rockingham
Illinois15270Madison
New York15481Onondaga
Oregon1182Umatilla
Vermont1193Caledonia
Washington11205Clark
Minnesota10394Hennepin
Wisconsin10894Milwaukee
Connecticut6291Hartford
New Jersey4676Camden
Montana1115Silver Bow
South Dakota1190Pennington
Wyoming1180 :DLaramie
Colorado0--
New Mexico0--
Utah0--

I-275 doesn't go into Genesee County in Michigan.

SkyPesos

Quote from: JCinSummerfield on September 29, 2021, 04:53:29 PM
Quote from: SkyPesos on September 29, 2021, 03:27:18 PM
Updated leaderboard. Also removed I-294 from the list based on the replies. New highest for Illinois is now I-270 in Madison County for 15 miles.


StateLength (mi)InterstateCounty
California15540San Bernardino
Nevada12415Clark
North Carolina68485Mecklenburg
Florida61295Duval
Ohio55270Franklin
Pennsylvania4690Erie
Alabama34459Jefferson
Indiana31469Allen
West Virginia2681Berkeley
Delaware2395New Castle
Georgia2024Dade
Maryland1897Anne Arundel
South Carolina18185Greenville
Kansas17235Sedgwick
Michigan17275Genesee
Missouri17470Jackson
Iowa16880Pottawatomie
New Hampshire1695Rockingham
Illinois15270Madison
New York15481Onondaga
Oregon1182Umatilla
Vermont1193Caledonia
Washington11205Clark
Minnesota10394Hennepin
Wisconsin10894Milwaukee
Connecticut6291Hartford
New Jersey4676Camden
Montana1115Silver Bow
South Dakota1190Pennington
Wyoming1180 :DLaramie
Colorado0--
New Mexico0--
Utah0--

I-275 doesn't go into Genesee County in Michigan.
Oops, that is supposed to be I-475.

Great Lakes Roads

#35
RI- I-195 through Providence County for 4.30 miles.
NJ- I-676 through Camden County for 4.75 miles.
OK- I-240 through Oklahoma County for 16.8 miles. It will still be the longest interstate to go through one county in Oklahoma if FHWA approves the "extended" version of I-240.

jlam

ID - I-184 through Ada County for 3.6 miles

KY - I-265 through Jefferson County for 25 miles

LA - I-210 through Calcasieu Parish for 12.4 miles





JayhawkCO

ME: I-395 5.00 miles in Penobscot County
MA: I-190 is 19.26 miles in Worcester County
MS: I-110 is 4.10 miles in Harrison County
NE: I-680 is 13.32 miles in Douglas County
TN: I-240 is 19.27 miles in Shelby County
TX: I-410 is 49.488 miles in Bexar County
VT: I-93 is 11.104 miles in Caledonia County
VA: I-564 is 3.03 miles in the City of Norfolk

Chris

Rothman

Quote from: 1 on September 29, 2021, 04:29:41 PM
Quote from: webny99 on September 29, 2021, 03:18:52 PM
Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.

The northern end is ambiguous. One of the two possibilities has it crossing the Hudson.
Meh.  It's not ambiguoius.  It crosses the bridge. :)
Please note: All comments here represent my own personal opinion and do not reflect the official position(s) of NYSDOT.

skluth

I'm confused about the thought process regarding I-270 near St Louis. SkyPeso's suggestion of 35 miles in I-270 in St Louis County (SLC), MO, is longer than the listed I-470 in Jackson County. (I used to live in South SLC and can verify it never leaves SLC in Missouri. The 35 miles sounds about right.) I thought I-270 wasn't in the table because it does cross state lines into another county, but so does the longest entry, I-40 in California as does the other half of I-270 in Madison County, IL.

SkyPesos

Quote from: skluth on September 29, 2021, 08:06:33 PM
I'm confused about the thought process regarding I-270 near St Louis. SkyPeso's suggestion of 35 miles in I-270 in St Louis County (SLC), MO, is longer than the listed I-470 in Jackson County. (I used to live in South SLC and can verify it never leaves SLC in Missouri. The 35 miles sounds about right.) I thought I-270 wasn't in the table because it does cross state lines into another county, but so does the longest entry, I-40 in California as does the other half of I-270 in Madison County, IL.
Based on what I'm getting at from the op, it only has to go through a single county in a state for it to count. OP listed 3 2di that goes through only one county in one of the states it goes through, but overall, goes through multiple counties adding up other states.

As for I-270, it actually does enter the City of St Louis (an independent city) between the Riverview Dr exit and the MO-IL line. So it doesn't count for MO because it enters 2 county equivalent jurisdictions in MO, and counts for IL for entering one county in IL.

empirestate

Quote from: Rothman on September 29, 2021, 06:25:52 PM
Quote from: 1 on September 29, 2021, 04:29:41 PM
Quote from: webny99 on September 29, 2021, 03:18:52 PM
Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.

The northern end is ambiguous. One of the two possibilities has it crossing the Hudson.
Meh.  It's not ambiguoius.  It crosses the bridge. :)

Yes, I-787 enters Rensselaer County, even if secretly. It's 10.16 miles from McCarty Ave. in Albany to 8th St. in Troy. Signage and in-field evidence of this may vary, but that part of the route has never been de-designated.

Doesn't change anything as far as its status for this topic, but there you go.

skluth

Quote from: SkyPesos on September 29, 2021, 08:13:38 PM
Quote from: skluth on September 29, 2021, 08:06:33 PM
I'm confused about the thought process regarding I-270 near St Louis. SkyPeso's suggestion of 35 miles in I-270 in St Louis County (SLC), MO, is longer than the listed I-470 in Jackson County. (I used to live in South SLC and can verify it never leaves SLC in Missouri. The 35 miles sounds about right.) I thought I-270 wasn't in the table because it does cross state lines into another county, but so does the longest entry, I-40 in California as does the other half of I-270 in Madison County, IL.
Based on what I'm getting at from the op, it only has to go through a single county in a state for it to count. OP listed 3 2di that goes through only one county in one of the states it goes through, but overall, goes through multiple counties adding up other states.

As for I-270, it actually does enter the City of St Louis (an independent city) between the Riverview Dr exit and the MO-IL line. So it doesn't count for MO because it enters 2 county equivalent jurisdictions in MO, and counts for IL for entering one county in IL.

Oops. I forgot about that sliver along Riverview.

webny99

Quote from: empirestate on September 29, 2021, 08:20:26 PM
Quote from: Rothman on September 29, 2021, 06:25:52 PM
Quote from: 1 on September 29, 2021, 04:29:41 PM
Quote from: webny99 on September 29, 2021, 03:18:52 PM
Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.

The northern end is ambiguous. One of the two possibilities has it crossing the Hudson.
Meh.  It's not ambiguoius.  It crosses the bridge. :)

Yes, I-787 enters Rensselaer County, even if secretly. It's 10.16 miles from McCarty Ave. in Albany to 8th St. in Troy. Signage and in-field evidence of this may vary, but that part of the route has never been de-designated.

Doesn't change anything as far as its status for this topic, but there you go.

The Wikipedia page explicitly states that the entire route is in Albany County, so I guess that's inaccurate. Google has an I-787 shield north of NY 7, so I guess that's inaccurate as well.

But to me the bigger issue is the I-787 to NY 787 transition. Not sure how it can be both a continuous and disjointed route.

jlam


empirestate

Quote from: webny99 on September 29, 2021, 08:35:37 PM
The Wikipedia page explicitly states that the entire route is in Albany County, so I guess that's inaccurate. Google has an I-787 shield north of NY 7, so I guess that's inaccurate as well.

Well, not entirely inaccurate–that is how the route is signed for thru traffic. There's just a bit of a difference between how the route is signed as a touring route, and what it actually is behind the scenes. It's one in a long line of such instances around the state, another notable one being NY 15. (It was signed for many years concurrent with I-390 and NY 17, despite not "actually" existing south of Wayland.)

QuoteBut to me the bigger issue is the I-787 to NY 787 transition. Not sure how it can be both a continuous and disjointed route.

It takes some getting used to, indeed. Even if you look it up on the FHWA map viewer, you will see both the official route turning east into Troy, and an I-787 shield continuing north toward Cohoes. But again, it's really just a matter of thinking of the publicly-signed routes as being a modified/idealized/simplified version of the actual inventory of routes and roadways.

For myself, I just think of NY 787 being topologically a spur from I-787, not a direct continuation of it. Wouldn't be the only spot where a continuous designation takes a turn through an interchange, while a different route follows the through roadway!

webny99

Quote from: empirestate on September 29, 2021, 08:50:28 PM
For myself, I just think of NY 787 being topologically a spur from I-787, not a direct continuation of it. Wouldn't be the only spot where a continuous designation takes a turn through an interchange, while a different route follows the through roadway!

I guess it's not completely non-sensical, but it's not like there's any reason why the section over the bridge needs to be I-787. It's already NY 7.

There's certainly plenty of examples where the through roadway makes a turn and another route continues straight, but this has to be one of the only examples where the route that makes the turn and the route that continues have the same number. This means that technically three of the four approaches to the NY 7/I-787/NY 787 interchange have the same number.

vdeane

Quote from: webny99 on September 29, 2021, 08:35:37 PM
Quote from: empirestate on September 29, 2021, 08:20:26 PM
Quote from: Rothman on September 29, 2021, 06:25:52 PM
Quote from: 1 on September 29, 2021, 04:29:41 PM
Quote from: webny99 on September 29, 2021, 03:18:52 PM
Quote from: empirestate on September 29, 2021, 12:32:55 AM
Quote from: webny99 on September 28, 2021, 07:51:12 PM
-I-787, Albany County, 9.6 miles

Welllllll... :confused:

What am I missing here? Wikipedia and my own eyes agree that I-787 is entirely in Albany County.

The northern end is ambiguous. One of the two possibilities has it crossing the Hudson.
Meh.  It's not ambiguoius.  It crosses the bridge. :)

Yes, I-787 enters Rensselaer County, even if secretly. It's 10.16 miles from McCarty Ave. in Albany to 8th St. in Troy. Signage and in-field evidence of this may vary, but that part of the route has never been de-designated.

Doesn't change anything as far as its status for this topic, but there you go.

The Wikipedia page explicitly states that the entire route is in Albany County, so I guess that's inaccurate. Google has an I-787 shield north of NY 7, so I guess that's inaccurate as well.

But to me the bigger issue is the I-787 to NY 787 transition. Not sure how it can be both a continuous and disjointed route.
Technically it starts where the exit 23 toll booths were (the lanes to US 9W where the Southside Route was supposed to be are reference route 912S).  And it's not disjointed; NY 787 technically begins where "exit 9E" (aka actual I-787) diverts off.  This is not what's signed (mostly), but it's how it's inventoried.  I-787 is interesting that way.

Quote from: empirestate on September 29, 2021, 08:50:28 PM
For myself, I just think of NY 787 being topologically a spur from I-787, not a direct continuation of it. Wouldn't be the only spot where a continuous designation takes a turn through an interchange, while a different route follows the through roadway!
In a way it's actually the opposite of I-283/PA 283.
Please note: All comments here represent my own personal opinion and do not reflect the official position of NYSDOT or its affiliates.

SkyPesos

Quote from: webny99 on September 29, 2021, 08:35:37 PM
The Wikipedia page explicitly states that the entire route is in Albany County, so I guess that's inaccurate.
Similar case: The Wikipedia page I-294 also states that it's entirely in Cook County, though that has already been proved wrong earlier in this thread.

rlb2024




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