Highways that transit a state with water boundaries at both entry points

[TheHighwayMan3561]

Minnesota has a few, not limited to:

I-494 crosses the Dakota/Hennepin line at the Minnesota River and the Dakota/Washington line at the Mississippi.
US 169 crosses the Hennepin/Anoka line at the Mississippi River and the Hennepin/Scott line at the Minnesota River.
MN 101 crosses the Wright/Hennepin line at the Crow River and the Sherburne/Wright line at the Mississippi.
MN 55 crosses the Hennepin/Wright line at the Crow River and the Hennepin/Dakota line at the Minnesota.

[Scott5114]

I'm going to stretch the definition of a water border a bit and mention I-70 in MO. The border crossing in St. Louis is obvious, Stan Musial Bridge over the Mississippi River. On the other side, the MO-KS border is about half a mile east of the Kansas River. The reason why I'm counting this is because it's a single bridge structure crossing both the MO-KS border and the Kansas River, with no exits to the small part of Kansas between those two. When a driver passes the last I-70 exit in Missouri and gets on the bridge, they cross both the state line and the river, and the next exit is on the "mainland" part of Kansas.

A fake river boundary!

[Occidental Tourist]

I-10 in California, Pacific Ocean at west end, Colorado River at east end.

I-8 as well.  Same boundaries.

[dkblake]

I'm interested to see if there are any state routes anywhere in the nation that do.

NH: NH 9 starts from VT 9 over the Connecticut River, becomes ME 9 over the Salmon Falls River

Note that, while NH 9 is a state route, VT/NH/ME 9 were Route 9 of the 1922 New England route system.

[roadman65]

I-10 in California, Pacific Ocean at west end, Colorado River at east end.

I-8 as well.  Same boundaries.

No.  The ocean may be water, but seven miles out it's no man's land. So it's not a boundary.

[hotdogPi]

I-10 in California, Pacific Ocean at west end, Colorado River at east end.

I-8 as well.  Same boundaries.

No.  The ocean may be water, but seven miles out it's no man's land. So it's not a boundary.

Thought it was 3 nautical miles (3.45 regular miles) for the state boundary and 12 for the country.

[mgk920]

Wisconsin:

-US 2 (east section) - (MI) Brule River <-> (MI) Menominee River
-US 2 (west section) - (MI) Montreal River <-> (MN) Saint Louis River
-US 8 - (MI) Menominee River <->  (MN) Saint Croix River
-US 10 - (MI) Lake Michigan Badger Ferry <-> (MN) Saint Croix River
-US 61 - (IA) Mississippi River <-> (MN) Mississippi River
-US 141 (north section) - (MI) Brule River <-> (MI) Menominee River

Mike

[jp the roadgeek]

.

Speaking of I-70 in MO, are there examples of highways that have a water crossing on both entry points of a county? I was going to count I-70 and I-64 in St. Louis county, but forgot that St. Louis city is independent from the county, which disqualifies those 2 highways.

US 1 in CT has a water crossing at each county it enters (I-95 shares all but the last).

Byram River between Westchester (NY) and Fairfield County
Housatonic River between Fairfield and New Haven County
Hammonasset River between New Haven and Middlesex County
Connecticut River between Middlesex and New London County (concurrent w/I-95)
Pawcatuck River between New London and Washington (South) County, RI