US Bridges

S 531-WESTSIDE RD over Sawtooth Creek

Fair

Ravalli County, Montana · 3M SW Hamilton · Structure no. S00531003+04001

Built
1972
53 years old
Condition
Fair
inspected November 2024
Type
Culvert
Steel
Length
54 ft
2 main spans
Daily traffic
972
2023 count
Owner
County
County Highway Agency

About this bridge

S 531-WESTSIDE RD over Sawtooth Creek is a steel culvert carrying S 531-WESTSIDE RD over Sawtooth 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 972 vehicles a day, projected to reach 1,021 by 2043. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

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CarriesS 531-WESTSIDE RD
CrossesSawtooth Creek
Location3M SW Hamilton
RouteCounty Highway 531
CountyRavalli County
StateMontana
Coordinates46.22975, -114.1917
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic972 (2023)
Projected traffic1,021 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 Sawtooth Creek built?

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

What condition is S 531-WESTSIDE RD over Sawtooth 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 Sawtooth Creek carry?

About 972 vehicles per day (2023 count).

How long is S 531-WESTSIDE RD over Sawtooth Creek?

The structure is 54 ft (16.5 m) long with a longest span of 25 ft (7.6 m).

Who owns S 531-WESTSIDE RD over Sawtooth Creek?

It is owned by the County Highway Agency.