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Author Topic: Longest statewide interstate segments that go through only one county  (Read 6555 times)

KCRoadFan

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Building upon the thread I created about the longest state highways that only went through one county, I thought of a similar question: when we break down interstate highways into segments based on the state, we find that there are some that only go through one county in that particular state. Among these single-county statewide interstate segments, which ones are the longest? Here are the ones I've thought of:

  • I-40 in California - 155 miles, all in San Bernardino County
  • I-15 in Nevada - 124 miles, all in Clark County
  • I-90 in Pennsylvania - 46 miles, all in Erie County

Aside from the ones I've mentioned above, what other interstate segments are there like that, especially ones of comparable length? I'd be interested to find out more.
« Last Edit: September 27, 2021, 01:41:36 AM by KCRoadFan »
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jp the roadgeek

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Re: Longest statewide interstate segments that go through only one county
« Reply #1 on: September 27, 2021, 01:52:18 AM »

I-81 in WV and MD: All 26 WV miles are in Berkeley County and all 12 MD miles are in Washington County.

You can make a case for I-83 in MD, since Baltimore City is technically not a county (36 miles)

I-95 in DE and NH: 23 miles  all in New Castle County and 16 miles all in Rockingham County

I-97 is all in Anne Arundel County, MD

I-84 eastbound in MA: all 7.6 miles in Worcester County (westbound lanes clip Hampden County)

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TheHighwayMan394

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Re: Longest statewide interstate segments that go through only one county
« Reply #2 on: September 27, 2021, 02:03:58 AM »

MN's by default is I-394 at 9.7 miles all in Hennepin County. All other MN interstates enter multiple counties.
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Great Lakes Roads

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Re: Longest statewide interstate segments that go through only one county
« Reply #3 on: September 27, 2021, 02:28:59 AM »

Indiana: I-469 in all of Allen County at 30.822 miles. Runner up would be I-865 in Boone County at 4.72 miles.
Illinois: I-294 in all of Cook County at 52.75 miles. Runner up would be I-270 in Madison County at 14.57 miles.
« Last Edit: September 27, 2021, 02:34:33 AM by Great Lakes Roads »
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GaryV

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Re: Longest statewide interstate segments that go through only one county
« Reply #4 on: September 27, 2021, 06:34:12 AM »

Michigan has a few 3di's (I-475, I-675, I-194, unsigned I-296) but no 2di's.
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NWI_Irish96

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Re: Longest statewide interstate segments that go through only one county
« Reply #5 on: September 27, 2021, 07:31:59 AM »

Indiana: I-469 in all of Allen County at 30.822 miles. Runner up would be I-865 in Boone County at 4.72 miles.
Illinois: I-294 in all of Cook County at 52.75 miles. Runner up would be I-270 in Madison County at 14.57 miles.

The end sign for I-294 is just north of Lake-Cook Road.
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DJDBVT

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Re: Longest statewide interstate segments that go through only one county
« Reply #6 on: September 28, 2021, 06:37:03 PM »

I-93 in VT - 11 miles, Caledonia County
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Re: Longest statewide interstate segments that go through only one county
« Reply #7 on: September 28, 2021, 06:56:51 PM »

Indiana: I-469 in all of Allen County at 30.822 miles. Runner up would be I-865 in Boone County at 4.72 miles.
Illinois: I-294 in all of Cook County at 52.75 miles. Runner up would be I-270 in Madison County at 14.57 miles.

The end sign for I-294 is just north of Lake-Cook Road.

We've discussed this before, and the consensus seemed to be that I-294 enters DuPage county near where those ramps to westbound I-88 branch off.
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SkyPesos

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Re: Longest statewide interstate segments that go through only one county
« Reply #8 on: September 28, 2021, 07:26:15 PM »

I think the winners for both Missouri and Ohio are their respective I-270 variants:
Ohio: I-270, 55 miles in Franklin County
Missouri: I-270, 35 miles in St Louis County
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My Fictional Highways

Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

US 89

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Re: Longest statewide interstate segments that go through only one county
« Reply #9 on: September 28, 2021, 07:43:56 PM »

Undefined in Utah as all five interstates enter multiple counties.

The same is true of New Mexico and Colorado (I-270 barely enters Denver limits). Curious if there are any others.

webny99

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Re: Longest statewide interstate segments that go through only one county
« Reply #10 on: September 28, 2021, 07:51:12 PM »

I-490 in NY is an interesting case. It's pretty close, but clips Genesee and Ontario counties on either end for 3 counties total. About 34 of its 37 miles are in Monroe County.

Other NY interstates that are entirely within one county...

-I-481, Onondaga County, 15.1 miles
-I-690, Onondaga County, 14.2 miles
-I-99, Steuben County, 13.1 miles
-I-290, Erie County, 10.2 miles
-I-787, Albany County, 9.6 miles
-I-990, Erie County, 6.4 miles
-I-590, Monroe County, 5.0 miles
-I-781, Jefferson County, 4.9 miles
-I-790, Oneida County, 2.3 miles
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SkyPesos

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Re: Longest statewide interstate segments that go through only one county
« Reply #11 on: September 28, 2021, 07:57:11 PM »

I-490 in NY is an interesting case. It's pretty close, but clips Genesee and Ontario counties on either end for 3 counties total. About 34 of its 37 miles are in Monroe County
Similar case with I-465 in Indiana. Clips Boone County on the northwest corner for about 1 mile, and bumps into Hamilton County at its interchange with US 31 on the north loop for about 2.5 miles. Otherwise, it is in Marion County for the remaining 49 ish miles.

Other NY interstates that are entirely within one county...

-I-481, Onondaga County, 15.1 miles
-I-690, Onondaga County, 14.2 miles
-I-99, Steuben County, 13.1 miles
-I-290, Erie County, 10.2 miles
-I-787, Albany County, 9.6 miles
-I-990, Erie County, 6.4 miles
-I-590, Monroe County, 5.0 miles
-I-781, Jefferson County, 4.9 miles
-I-790, Oneida County, 2.3 miles
How about I-78 in Manhattan for less than a mile?  :bigass:
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My Fictional Highways

Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

Dirt Roads

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Re: Longest statewide interstate segments that go through only one county
« Reply #12 on: September 28, 2021, 08:22:40 PM »

All of I-485 around Charlotte are in Mecklenburg County, about 67 miles.  Amazingly, a little sliver of I-540 is not in Wake County, as the interchange with I-40 (starting point) is actually in Durham County.
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ran4sh

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Re: Longest statewide interstate segments that go through only one county
« Reply #13 on: September 28, 2021, 08:30:14 PM »

In Georgia it is I-59 which is about 20 miles in Dade County.

The only other Georgia Interstates that go through just one county, are I-24 (also Dade County), I-520 (Richmond County), and I-516 (Chatham County).
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Top 5 Most Traveled Routes: Interstates 40, 20, 10, 5, 95
Top 5 Longest Clinched Routes: I-20, I-85, I-24, I-16, and NJ Turnpike mainline

jp the roadgeek

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Re: Longest statewide interstate segments that go through only one county
« Reply #14 on: September 28, 2021, 08:33:24 PM »

CT only has 2 that qualify.

I-291 at 6.4 miles in Hartford County.

I-684 at 1.41 miles in Fairfield County.

RI only has I-195 at 4.3 miles in Providence County
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Interstates I've clinched: 97, 290 (MA), 291 (CT), 291 (MA), 293, 295 (DE-NJ-PA), 295 (RI-MA), 384, 391, 395 (CT-MA), 395 (MD), 495 (DE), 610 (LA), 684, 691, 695 (MD), 695 (NY), 795 (MD)

SkyPesos

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Re: Longest statewide interstate segments that go through only one county
« Reply #15 on: September 28, 2021, 11:06:51 PM »

Thought it would be interesting to pile up a leaderboard for this

(Also a correction to what I wrote above for Missouri: I-270 actually enters St Louis City for the last mile in the state, which disqualifies it from the thread. The new highest in the state is I-470 for 17 miles in Jackson County.)

StateLength (mi)InterstateCounty
California15540San Bernardino
Nevada12415Clark
North Carolina68485Mecklenburg
Ohio55270Franklin
Illinois53294Cook
Pennsylvania4690Erie
Indiana31469Allen
West Virginia2681Berkeley
Delaware2395New Castle
Georgia2024Dade
Maryland1897Anne Arundel
Michigan17275Genesee
Missouri17470Jackson
New Hampshire1695Rockingham
New York15481Onondaga
Oregon1182Umatilla
Vermont1193Caledonia
Washington11205Clark
Minnesota10394Hennepin
Connecticut6291Hartford
Colorado0--
New Mexico0--
Utah0--


« Last Edit: September 28, 2021, 11:11:34 PM by SkyPesos »
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My Fictional Highways

Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

TJS23

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Re: Longest statewide interstate segments that go through only one county
« Reply #16 on: September 28, 2021, 11:36:45 PM »

I just looked at Interstate 10 in Riverside County and it looks like it ties or beats Interstate 40 by a mile
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SkyPesos

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Re: Longest statewide interstate segments that go through only one county
« Reply #17 on: September 28, 2021, 11:38:26 PM »

I just looked at Interstate 10 in Riverside County and it looks like it ties or beats Interstate 40 by a mile
I-10 also goes through LA and San Bernardino counties in the state.
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My Fictional Highways

Fundamental Theorem of AARoads - Let "y" represent the elevation above sea level in a certain area. If "Δy" between the highest and lowest values of y equals to 0, it's Illinois.

jlam

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Re: Longest statewide interstate segments that go through only one county
« Reply #18 on: September 28, 2021, 11:40:08 PM »

I will contribute Kansas. Kansas's longest is I-235, which spends all of its 16.5 miles in Sedgwick county.
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Crown Victoria

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Re: Longest statewide interstate segments that go through only one county
« Reply #19 on: September 28, 2021, 11:45:36 PM »

Looks like Florida's would be I-295 around and in Jacksonville, at 60.86 miles. I-295 does run along the border between Duval County and Clay County, but is entirely within the former. Florida also has I-595 (Broward), I-395 and I-195 (Miami-Dade), I-175 and I-375 (Pinellas), and I-110 (Escambia).

For South Carolina, I-185 is entirely within Greenville County for 17.7 miles. I-585 is also only in one county (Spartanburg), as is I-126 (Richland) and I-520 while in SC (Aiken). I-526 is longer and mostly in Charleston County, but briefly enters Berkeley County. I-385 was formerly only in Greenville County, but was extended into Laurens County during the 1980's.

For New Jersey, I-676 (3.84 miles, Camden County) beats I-76 (3.08 miles, also in Camden County) and I-278 (2 miles, Union County).
« Last Edit: September 29, 2021, 12:01:34 AM by Crown Victoria »
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TheHighwayMan394

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Re: Longest statewide interstate segments that go through only one county
« Reply #20 on: September 28, 2021, 11:57:49 PM »

Iowa: I-880, Pottawatomie (16)
Montana: I-115, Silver Bow (1)
South Dakota: I-190, Pennington (1)
Wisconsin: I-894, Milwaukee (10)

North Dakota has no qualifying routes, as unsigned I-194 exists in two counties.
« Last Edit: September 29, 2021, 12:10:14 AM by TheHighwayMan394 »
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MinecraftNinja

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Re: Longest statewide interstate segments that go through only one county
« Reply #21 on: September 29, 2021, 12:04:55 AM »

New Jersey: I-76 in Camden County.
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empirestate

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Re: Longest statewide interstate segments that go through only one county
« Reply #22 on: September 29, 2021, 12:32:55 AM »

-I-787, Albany County, 9.6 miles

Welllllll… :confused:
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US20IL64

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Re: Longest statewide interstate segments that go through only one county
« Reply #23 on: September 29, 2021, 12:33:25 AM »

Indiana: I-469 in all of Allen County at 30.822 miles. Runner up would be I-865 in Boone County at 4.72 miles.
Illinois: I-294 in all of Cook County at 52.75 miles. Runner up would be I-270 in Madison County at 14.57 miles.

The end sign for I-294 is just north of Lake-Cook Road.

We've discussed this before, and the consensus seemed to be that I-294 enters DuPage county near where those ramps to westbound I-88 branch off.

294 is on the County Line, between 22nd and 31st street overpasses.
So, winner [for north 1/2 of IL] is I-190, in Cook, 3 miles. I-180 is in 2 cos.
« Last Edit: September 29, 2021, 04:32:44 PM by US20IL64 »
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GaryV

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Re: Longest statewide interstate segments that go through only one county
« Reply #24 on: September 29, 2021, 07:41:50 AM »

That's I-475 in Genesee Co., MI
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