US Bridges

US 89 over Yellowstone River

Fair

Park County, Montana · 6M NE Livingston · Structure no. P00059001+05131

Built
1955
70 years old, rebuilt 2011
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
394 ft
4 main spans
Daily traffic
2,174
2023 count
Owner
State
State Highway Agency

About this bridge

US 89 over Yellowstone River is a steel continuous stringer/multi-beam or girder carrying US 89 over Yellowstone River in Park County, Montana. It was built in 1955 and reconstructed in 2011, so it is 70 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 5 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 2,174 vehicles a day, roughly 2% of them trucks, projected to reach 2,283 by 2043. The structure is 394 ft (120.1 m) long and 33 ft wide. If it were closed, the detour would be 88.2 mi (142 km).

Location

Open in Google Maps
CarriesUS 89
CrossesYellowstone River
Location6M NE Livingston
RouteU.S. Route 89
CountyPark County
StateMontana
Coordinates45.71796, -110.4675
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 15
Structure length394 ft (120.1 m)
Longest span108 ft (32.9 m)
Deck width33 ft (10.2 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,174 (2023)
Projected traffic2,283 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed88.2 mi (142 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.7 million
NavigationNo navigation control on waterway

Frequently asked questions

When was US 89 over Yellowstone River built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2011.

What condition is US 89 over Yellowstone 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 2023.

How much traffic does US 89 over Yellowstone River carry?

About 2,174 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is US 89 over Yellowstone River?

The structure is 394 ft (120.1 m) long with a longest span of 108 ft (32.9 m) and a deck 33 ft wide.

Who owns US 89 over Yellowstone River?

It is owned by the State Highway Agency.