US Bridges

S 531-WESTSIDE RD over Roaring Lion Creek

Fair

Ravalli County, Montana · 1M SW Hamilton · Structure no. S00531001+06001

Built
1972
53 years old
Condition
Fair
inspected November 2024
Type
Tee Beam
Concrete
Length
22 ft
1 main span
Daily traffic
519
2023 count
Owner
County
County Highway Agency

About this bridge

S 531-WESTSIDE RD over Roaring Lion Creek is a concrete tee beam carrying S 531-WESTSIDE RD over Roaring Lion Creek in Ravalli County, Montana. It was built in 1972, so it is 53 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 519 vehicles a day, projected to reach 545 by 2043. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

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CarriesS 531-WESTSIDE RD
CrossesRoaring Lion Creek
Location1M SW Hamilton
RouteCounty Highway 531
CountyRavalli County
StateMontana
Coordinates46.21698, -114.17626
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckNot applicable
Main spans1
Design loadUnknown
Structure length22 ft (6.7 m)
Longest span21 ft (6.4 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic519 (2023)
Projected traffic545 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 531-WESTSIDE RD over Roaring Lion Creek built?

It was built in 1972, making it 53 years old in 2025.

What condition is S 531-WESTSIDE RD over Roaring Lion Creek 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 November 2024.

How much traffic does S 531-WESTSIDE RD over Roaring Lion Creek carry?

About 519 vehicles per day (2023 count).

How long is S 531-WESTSIDE RD over Roaring Lion Creek?

The structure is 22 ft (6.7 m) long with a longest span of 21 ft (6.4 m) and a deck 30 ft wide.

Who owns S 531-WESTSIDE RD over Roaring Lion Creek?

It is owned by the County Highway Agency.