US Bridges

Old HWY 10 E over Clark Fk-Rr 060

FairPosted for load

Mineral County, Montana · ST Regis · Structure no. L31179013+04001

Built
1942
83 years old, rebuilt 1986
Condition
Fair
inspected June 2023
Type
Truss - Deck
Steel
Length
787 ft
3 main spans
Daily traffic
140
2023 count
Owner
State
State Highway Agency

About this bridge

Old HWY 10 E over Clark Fk-Rr 060 is a steel truss - deck carrying Old HWY 10 E over Clark Fk-Rr 060 in Mineral County, Montana. It was built in 1942 and reconstructed in 1986, so it is 83 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 140 vehicles a day, projected to reach 147 by 2043. The structure is 787 ft (239.8 m) long and 31 ft wide. If it were closed, the detour would be 16.8 mi (27 km).

Location

Open in Google Maps
CarriesOld HWY 10 E
CrossesClark Fk-Rr 060
LocationST Regis
RouteState Highway 31179
CountyMineral County
StateMontana
Coordinates47.2932, -115.09112
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeTruss - Deck
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+6 approach)
Design loadH 15
Structure length787 ft (239.8 m)
Longest span180 ft (54.9 m)
Deck width31 ft (9.4 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic140 (2023)
Projected traffic147 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed16.8 mi (27 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 Old HWY 10 E over Clark Fk-Rr 060 built?

It was built in 1942, making it 83 years old in 2025. It was reconstructed in 1986.

What condition is Old HWY 10 E over Clark Fk-Rr 060 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 June 2023.

How much traffic does Old HWY 10 E over Clark Fk-Rr 060 carry?

About 140 vehicles per day (2023 count).

How long is Old HWY 10 E over Clark Fk-Rr 060?

The structure is 787 ft (239.8 m) long with a longest span of 180 ft (54.9 m) and a deck 31 ft wide.

Who owns Old HWY 10 E over Clark Fk-Rr 060?

It is owned by the State Highway Agency.