There was previously this thread (https://www.aaroads.com/forum/index.php?topic=9770.100) about roads that follow state or county lines. However, most of the ones brought up were local/county roads. I'm curious how many numbered routes (ideally Interstates or U.S. routes, but state highways are also alright) there are that follow state or county lines for some stretch.
For example, US-71 follows the Texas-Arkansas state line north of Texarkana. For a county example, US-12 does this for a few miles along the Washtenaw-Lenawee line in Michigan. Easy to find state highway examples in Michigan as well, such as the infamous M-102.
Not a numbered road but I have a notable historical example for California. The Stockton-Los Angeles Road was used the baseline south of the Merced River for Mariposa/Merced county line when the latter split from the former in 1855.
Quote from: Max Rockatansky on June 15, 2023, 07:30:12 PM
Not a numbered road but I have a notable historical example for California. The Stockton-Los Angeles Road was used the baseline south of the Merced River for Mariposa/Merced county line when the latter split from the former in 1855.
Interesting! Seems like some of the road still exists as "Hornitos Road", according to OpenStreetMap anyway. Kinda funny that the route across the Central Valley that made the most sense at the time followed the east side of the valley, given that the current route used (I-5) follows the west side.
Quote from: Ellie on June 15, 2023, 07:40:16 PM
Quote from: Max Rockatansky on June 15, 2023, 07:30:12 PM
Not a numbered road but I have a notable historical example for California. The Stockton-Los Angeles Road was used the baseline south of the Merced River for Mariposa/Merced county line when the latter split from the former in 1855.
Interesting! Seems like some of the road still exists as "Hornitos Road", according to OpenStreetMap anyway. Kinda funny that the route across the Central Valley that made the most sense at the time followed the east side of the valley, given that the current route used (I-5) follows the west side.
The problem at the time was that the Central Valley was a swampy mess with erratic water levels in the rivers and sloughs filling Tulare Lake. It was easier to form a stage road that followed the foothills of the Sierra Nevada Mountains. That changed in the 1860s and 1870s when the Southern Pacific built a line through the Central Valley and started selling land to agriculture developers. By the 1880s the Stockton-Los Angeles Road was largely replaced by the Southern Pacific frontages that comprised early US 99. To tie this into something numbered, planned CA 65 follows the Stockton-Los Angeles Road corridor along the Mariposa/Merced county line.
US 1 follows the border between Philadelphia and Montgomery counties in Pennsylvania along City Avenue.
OK20/AR43
WI-134 follows the Dane / County line between Cambridge and London
WI-104 follows the Rock / Green County line
Someone said in the previous thread Maryland/Delaware 54, which does have segments that are fully within one state.
Not a perfect fit, but VA-83/WV-83 follows the state line off-and-on for about 1/2 mile stretch. There's six different segments actually running along the border; one segment is over a quarter-mile in length, and two segments about 500 feet long.
AR 5 follows the Pulaski/Lonoke county line for several miles.
NY 269 on the Niagara/Orleans county line and NY 272 on the Orleans/Monroe county line. NY 18 also briefly overlaps the latter.
M-13 follows the Saginaw/Genesee County line for several miles from Willard Road to Johnstone Road, then follows the Shiawassee/Genesee County line from Johnstone Road to where it ends at I-69.
M-102 is 8 Mile Road and follows the Wayne/Macomb line as well as the Wayne/Oakland line.
MN:
TH 120: Ramsey/Washington
TH 47: Mille Lacs/Kanabec
US 75: Lyon, IA/Rock, MN
TH 1: St. Louis/Itasca
TH 1/TH 6 duplex: Itasca/Koochiching
IN
I-64: Vanderburgh/Gibson
I-69: Gibson/Warrick
SR 4 (eastern): DeKalb/Steuben
SR 110 (eastern): Marshall/Fulton
SR 114 (eastern): Whitely/Huntington
SR 167: Blackford/Jay
SR 218: Huntington/Wells
SR 234 (western): Boone/Hendricks
SR 352: Warren (IN)/Vermillion (IL)
SR 362: Scott/Clark and Jefferson/Clark
Iowa Highway 25 runs along county lines between Iowa 2 and US 34.
At the south end, Ringgold County is to the east, and Taylor County is to the west.
At the north end, Adams County is to the west, and Union County to the east.
Quote from: TheHighwayMan394 on June 16, 2023, 12:05:59 AM
MN:
TH 120: Ramsey/Washington
TH 47: Mille Lacs/Kanabec
US 75: Lyon, IA/Rock, MN
TH 1: St. Louis/Itasca
TH 1/TH 6 duplex: Itasca/Koochiching
US 2: Polk / Red Lake
MN 13: Dakota / Ramsey
MN 13: Le Sueur / Scott
MN 19: Le Sueur / Scott
MN 19: Dakota / Rice
MN 19: Redwood / Yellow Medicine
MN 23: Chippewa / Renville
MN 28+SD 10: Roberts, SD / Traverse
MN 60: Le Sueur / Waseca
MN 64: Hubbard / Cass
MN 67: Redwood / Yellow Medicine
MN 87: Hubbard / Cass
MN 104: Swift / Kandiyohi
MN 264: Nobles / Jackson
MN 269: Pipestone / Rock
Since the 1970 annexation, VA 150 forms much of the border between Chesterfield County and the City of Richmond, and has been a full freeway along this stretch since the early 80's.
More Michigan partials:
H13 (multi-county route) follows the Alger/Schoolcraft county line
M-48 and M-129 on the Chippewa/Mackinaw county line
M-65 on the Alpena/Alcona county line
M-72 on the Leelanau/Grand Traverse county line
M-18 on the Crawford/Roscommon county line
M-30 on the Gratiot/Saginaw county line
M-66 on the Barry/Eaton county line
M-89 and (rerouted, concurrent) M-43 on the Barry/Kalamazoo county line
US-12 on the Washtenaw/Lenawee county line
US-127 on the Hillsdale/Lenawee county line
Quote from: GaryV on June 16, 2023, 09:35:40 AM
More Michigan partials:
H13 (multi-county route) follows the Alger/Schoolcraft county line
M-48 and M-129 on the Chippewa/Mackinaw county line
M-65 on the Alpena/Alcona county line
M-72 on the Leelanau/Grand Traverse county line
M-18 on the Crawford/Roscommon county line
M-30 on the Gratiot/Saginaw county line
M-66 on the Barry/Eaton county line
M-89 and (rerouted, concurrent) M-43 on the Barry/Kalamazoo county line
US-12 on the Washtenaw/Lenawee county line
US-127 on the Hillsdale/Lenawee county line
Actually M-30 ends at M-20. The part south of M-20 is Old M-30 and under county control. MDOT has discussed extending M-30 south to M-46 again though.
SD 20 runs right along the MT/SD border for a stretch.
Quote from: Flint1979 on June 16, 2023, 11:10:20 AM
Quote from: GaryV on June 16, 2023, 09:35:40 AM
More Michigan partials:
H13 (multi-county route) follows the Alger/Schoolcraft county line
M-48 and M-129 on the Chippewa/Mackinaw county line
M-65 on the Alpena/Alcona county line
M-72 on the Leelanau/Grand Traverse county line
M-18 on the Crawford/Roscommon county line
M-30 on the Gratiot/Saginaw county line
M-66 on the Barry/Eaton county line
M-89 and (rerouted, concurrent) M-43 on the Barry/Kalamazoo county line
US-12 on the Washtenaw/Lenawee county line
US-127 on the Hillsdale/Lenawee county line
Actually M-30 ends at M-20. The part south of M-20 is Old M-30 and under county control. MDOT has discussed extending M-30 south to M-46 again though.
It was transferred back to MDOT in the second half of 2022. I don't know if route shields have been installed yet.
Quote from: wanderer2575 on June 16, 2023, 11:36:55 AM
Quote from: Flint1979 on June 16, 2023, 11:10:20 AM
Quote from: GaryV on June 16, 2023, 09:35:40 AM
More Michigan partials:
H13 (multi-county route) follows the Alger/Schoolcraft county line
M-48 and M-129 on the Chippewa/Mackinaw county line
M-65 on the Alpena/Alcona county line
M-72 on the Leelanau/Grand Traverse county line
M-18 on the Crawford/Roscommon county line
M-30 on the Gratiot/Saginaw county line
M-66 on the Barry/Eaton county line
M-89 and (rerouted, concurrent) M-43 on the Barry/Kalamazoo county line
US-12 on the Washtenaw/Lenawee county line
US-127 on the Hillsdale/Lenawee county line
Actually M-30 ends at M-20. The part south of M-20 is Old M-30 and under county control. MDOT has discussed extending M-30 south to M-46 again though.
It was transferred back to MDOT in the second half of 2022. I don't know if route shields have been installed yet.
It's on the state highway map.
Here's the update from Chris Bessert's site, http://www.michiganhighways.org/listings/M-030.html :
Quote2022 (Sept 27, Oct 12) New! — MDOT completes jurisdictional transfers with the Midland Co Road Commission and Saginaw Co Road Commission to transfer 14.14 miles of Meridian Rd from M-46/Gratiot Rd—Monroe Rd northerly to M-20/Isabella Rd from county to state control as part of an effort to reacquire the remaining portion of Meridian Rd south of M-20 which was not re-transferred back to state control in 2009 (and was transferred from state jurisdiction to the county in 1962). The Saginaw Co transfer of 4.02 miles officially takes place on September 27 while the Midland Co transfer of the remaining 10.12 miles occurs 15 days later on October 12.This occurs just a few months more than exactly 60 years after these segments were cancelled as a state trunkline route and transferred to county control in 1962. Signage along the newly-transferred segment of roadway signifying its inclusion in the route of M-30 is likely to be erected in early-2023. (Thanks Patrick!)
North Dakota:
ND 1: LaMoure / Dickey
ND 1+SD 37: Dickey / Brown, SD
ND 3+SD 45: McIntosh / McPherson, SD
ND 5: Burke / Ward
ND 9: Foster / Stutsman
ND 13: Logan / McIntosh
ND 18: Cass / Richland
ND 19: McHenry / Pierce
ND 20: Cavalier / Ramsey
ND 30: Stutsman / Logan
ND 31: Morton / Grant
ND 32: Griggs / Steele
ND 32: Barnes / Ransom
ND 32: Cass / Ransom
ND 41: McLean / Burleigh
ND 46: Stutsman / Logan
ND 46: Stutsman / LaMoure
ND 46: Barnes / LaMoure
ND 46: Barnes / Ransom
ND 46: Cass / Ransom
ND 46: Cass / Richland
ND 50: Burke / Mountrail
ND 50: Ward / Mountrail
US 52: Burke / Ward
ND 67: Slope / Bowman
US 281: Benson / Ramsey
SD 1806: Sioux / Corson, SD
Quote from: wanderer2575 on June 16, 2023, 11:36:55 AM
Quote from: Flint1979 on June 16, 2023, 11:10:20 AM
Quote from: GaryV on June 16, 2023, 09:35:40 AM
More Michigan partials:
H13 (multi-county route) follows the Alger/Schoolcraft county line
M-48 and M-129 on the Chippewa/Mackinaw county line
M-65 on the Alpena/Alcona county line
M-72 on the Leelanau/Grand Traverse county line
M-18 on the Crawford/Roscommon county line
M-30 on the Gratiot/Saginaw county line
M-66 on the Barry/Eaton county line
M-89 and (rerouted, concurrent) M-43 on the Barry/Kalamazoo county line
US-12 on the Washtenaw/Lenawee county line
US-127 on the Hillsdale/Lenawee county line
Actually M-30 ends at M-20. The part south of M-20 is Old M-30 and under county control. MDOT has discussed extending M-30 south to M-46 again though.
It was transferred back to MDOT in the second half of 2022. I don't know if route shields have been installed yet.
They haven't so technically I wouldn't consider that M-30 until the signs are up. M-30 still has an END sign at M-20. Sometime in the future this might change but as of today I still say M-30's southern terminus is at M-20.
There are a couple of state numbered highways that run along the Kentucky-Tennessee line out in far southwestern Kentucky.
A short section of WV/VA 127 runs along the border of those two states.
In Kansas, part of US 40 between Topeka and Lawrence goes along the Shawnee/Douglas County line.
Local example: The Weld/Larimer County line has a road along most of it.
What I always wondered, is who maintains it, and who decides what it's called. The road I speak of is generally referred to as Weld CR 13, but it's in the spot where Larimer CR 1 would go, and I've seen it occasionally referred to as Larimer CR 1 (or just County Line Road).
It doesn't look like two different counties are maintaining the road, it 'feels and drives' like a Weld County road. Is the actual county line the centerline of the road, or ... ?
US 5 in VT closely follows the Connecticut River that forms the boundary with NH.
US 23 in Ohio on the Wood/Sandusky county line
* King Street (NY 120A) along the border between New York and Connecticut. In fact, despite being a New York state route, it crosses into Connecticut for a short distance at one point!
* County Line Road (Suffolk CR 1) along the border between Nassau and Suffolk counties in New York.
* Jericho Turnpike (NY 25) along the border between New York City and Nassau county for half a mile or so.
It's only a town line, but an interesting example is the CT 20 freeway following the town line between Windsor and Windsor Locks, CT. The history on this one is backwards from most: the freeway was originally built kinda-sorta near the town line, but crossed it a number of times. This led to some "islands" of each town that were stranded on the wrong side of the freeway. Windsor and Windsor Locks later agreed to re-align their town line to the median of CT 20 (and a short stretch of I-91) so that both towns' land was all on the "correct" side of the freeway.
The best view of this I can find is to compare the 1966 and 1973 topo maps in this area on historicaerials.com.
Quote from: hbelkins on June 16, 2023, 11:22:51 PM
A short section of WV/VA 127 runs along the border of those two states.
Roads along the WV/VA state line are pretty common since the line is mostly a ridge. In some cases, the road may not be entirely on the state line but will bounce back and forth across it depending on terrain obstacles. WVDOH and VDOT have worked out agreements for who handles these roads, sometimes leading to one agency maintaining parts of road in the other state.
Some examples, in addition to WV/VA 127 and WV/VA 83 that were previously mentioned:
- West Virginia maintains a portion of WV/VA 259 that straddles the state line between Hardy and Frederick Counties
- A 3-mile section of Virginia SR 691 (former VA 59) bounces back and forth across the WV/VA line.
- FR 85, maintained by George Washington National Forest, closely parallels the WV/VA line. Parts of it near Reddish Knob are directly on top of the ridge, on the state line. In one part, the road is 1-lane wide with guard rails on each side: https://goo.gl/maps/a7jwnoVaqo9H4mRh7
- FR 55 has the same setup towards Pocahontas and Bath counties, bouncing back and forth along the ridge line
- Virginia SR 601 in Highland County rides the state line in some areas and actually crosses over entirely into WV in a couple spots.
- Virginia SR 616 follows the state line with McDowell County, WV for about 16 miles starting at WV/VA 83
- McDowell CR 83/9 and CR 83/10 follow the VA/WV state line for a couple miles north of WV/VA 83
ID/WA 41 in Newport, WA/Oldtown, ID is an interesting case, where the Washington state route only exists to cover the Washington side of the road (which technically means it's a southbound-only highway for its entire 0.4-mile length). Supposedly, each half of the road is maintained by the respective state, but in practice it seems Idaho has been maintaining the entire thing (including a bridge replacement a few years back, which included street lighting installed on the Idaho side only).
The entire length of IN 110 is on the Marshall/Fulton county border.
US 31 spends a few miles on the Fulton/Miami county border.
The entire length of the eastern IN 4 is on the Steuben/DeKalb county border.
IN 114 spends a few miles on the Wabash/Whitley county border.
US 209 runs along the border of New Jersey from Bushkill to Matamoras.
NJ 29 follows the Pennsylvania border for its entire length.
CA-161 runs along the Oregon border for almost 10 miles. Oddly, none of the side roads on the Oregon side have any "state line" signage. And there is a Welcome to California sign on OR-39 about 0.1 mile inside Oregon.
Also, UT-7 in St George dips down and runs along the Arizona border for about a mile.