US Bridges

Sawmill RD over Clark Fork River 026

Fair

Powell County, Montana · Garrison · Structure no. L39027000+04001

Built
2006
19 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
168 ft
2 main spans
Daily traffic
78
2023 count
Owner
County
County Highway Agency

About this bridge

Sawmill RD over Clark Fork River 026 is a prestressed concrete stringer/multi-beam or girder carrying Sawmill RD over Clark Fork River 026 in Powell County, Montana. It was built in 2006, so it is 19 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 78 vehicles a day, roughly 3% of them trucks, projected to reach 83 by 2043. The structure is 168 ft (51.3 m) long and 30 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesSawmill RD
CrossesClark Fork River 026
LocationGarrison
RouteCounty Highway 39015
StateMontana
Coordinates46.5197, -112.80798
Functional classRural Local

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating63.1 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length168 ft (51.3 m)
Longest span83 ft (25.2 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic78 (2023)
Projected traffic83 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$148,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Sawmill RD over Clark Fork River 026 built?

It was built in 2006, making it 19 years old in 2025.

What condition is Sawmill RD over Clark Fork River 026 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 October 2023.

How much traffic does Sawmill RD over Clark Fork River 026 carry?

About 78 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sawmill RD over Clark Fork River 026?

The structure is 168 ft (51.3 m) long with a longest span of 83 ft (25.2 m) and a deck 30 ft wide.

Who owns Sawmill RD over Clark Fork River 026?

It is owned by the County Highway Agency.