US Bridges

Nye Rd-S 419 over Stillwater River

Fair

Stillwater County, Montana · Nye · Structure no. S00419019+09001

Built
1945
80 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
176 ft
4 main spans
Daily traffic
598
2023 count
Owner
State
State Highway Agency

About this bridge

Nye Rd-S 419 over Stillwater River is a concrete tee beam carrying Nye Rd-S 419 over Stillwater River in Stillwater County, Montana. It was built in 1945, so it is 80 years old, older than the Montana average of 47 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 598 vehicles a day, roughly 8% of them trucks, projected to reach 628 by 2043. The structure is 176 ft (53.6 m) long and 26 ft wide. If it were closed, the detour would be 44.7 mi (72 km).

Location

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CarriesNye Rd-S 419
CrossesStillwater River
LocationNye
RouteState Highway 419
CountyStillwater County
StateMontana
Coordinates45.43545, -109.79684
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating38 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length176 ft (53.6 m)
Longest span57 ft (17.4 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic598 (2023)
Projected traffic628 by 2043
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed44.7 mi (72 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Nye Rd-S 419 over Stillwater River built?

It was built in 1945, making it 80 years old in 2025.

What condition is Nye Rd-S 419 over Stillwater River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in May 2024.

How much traffic does Nye Rd-S 419 over Stillwater River carry?

About 598 vehicles per day (2023 count), of which roughly 8% are trucks.

How long is Nye Rd-S 419 over Stillwater River?

The structure is 176 ft (53.6 m) long with a longest span of 57 ft (17.4 m) and a deck 26 ft wide.

Who owns Nye Rd-S 419 over Stillwater River?

It is owned by the State Highway Agency.