US Bridges

Myers RD over Yellowstone River

Fair

Treasure County, Montana · Myers · Structure no. S00311010+00011

Built
1968
57 years old
Condition
Fair
inspected July 2024
Type
Girder and Floorbeam System
Steel Continuous
Length
706 ft
4 main spans
Daily traffic
96
2023 count
Owner
State
State Highway Agency

About this bridge

Myers RD over Yellowstone River is a steel continuous girder and floorbeam system carrying Myers RD over Yellowstone River in Treasure County, Montana. It was built in 1968, so it is 57 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 96 vehicles a day, roughly 14% of them trucks, projected to reach 101 by 2043. The structure is 706 ft (215.1 m) long and 33 ft wide. If it were closed, the detour would be 46 mi (74 km).

Location

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CarriesMyers RD
CrossesYellowstone River
LocationMyers
RouteState Highway 311
CountyTreasure County
StateMontana
Coordinates46.25436, -107.34551
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.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating16.4 US tons
Inventory rating9.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4 (+2 approach)
Design loadHS 15
Structure length706 ft (215.1 m)
Longest span172 ft (52.4 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic96 (2023)
Projected traffic101 by 2043
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed46 mi (74 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 Myers RD over Yellowstone River built?

It was built in 1968, making it 57 years old in 2025.

What condition is Myers RD 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 July 2024.

How much traffic does Myers RD over Yellowstone River carry?

About 96 vehicles per day (2023 count), of which roughly 14% are trucks.

How long is Myers RD over Yellowstone River?

The structure is 706 ft (215.1 m) long with a longest span of 172 ft (52.4 m) and a deck 33 ft wide.

Who owns Myers RD over Yellowstone River?

It is owned by the State Highway Agency.