US Bridges

S 566-TONGUE R RD over Tongue River

Fair

Rosebud County, Montana · 31M SW Ashland · Structure no. S00566031+03501

Built
1980
45 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
179 ft
3 main spans
Daily traffic
53
2023 count
Owner
County
County Highway Agency

About this bridge

S 566-TONGUE R RD over Tongue River is a steel continuous stringer/multi-beam or girder carrying S 566-TONGUE R RD over Tongue River in Rosebud County, Montana. It was built in 1980, so it is 45 years old, younger 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 53 vehicles a day, projected to reach 56 by 2043. The structure is 179 ft (54.6 m) long and 34 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

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CarriesS 566-TONGUE R RD
CrossesTongue River
Location31M SW Ashland
RouteCounty Highway 566
CountyRosebud County
StateMontana
Coordinates45.26866, -106.62521
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length179 ft (54.6 m)
Longest span67 ft (20.4 m)
Deck width34 ft (10.5 m)
Roadway width31 ft (9.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic53 (2023)
Projected traffic56 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 S 566-TONGUE R RD over Tongue River built?

It was built in 1980, making it 45 years old in 2025.

What condition is S 566-TONGUE R RD over Tongue 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 S 566-TONGUE R RD over Tongue River carry?

About 53 vehicles per day (2023 count).

How long is S 566-TONGUE R RD over Tongue River?

The structure is 179 ft (54.6 m) long with a longest span of 67 ft (20.4 m) and a deck 34 ft wide.

Who owns S 566-TONGUE R RD over Tongue River?

It is owned by the County Highway Agency.