US Bridges

Gravley RD over Red Rock River 085

FairPosted for load

Beaverhead County, Montana · 4M NW Lima · Structure no. L01265000+03001

Built
1982
43 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
48 ft
1 main span
Daily traffic
62
2023 count
Owner
County
County Highway Agency

About this bridge

Gravley RD over Red Rock River 085 is a steel stringer/multi-beam or girder carrying Gravley RD over Red Rock River 085 in Beaverhead County, Montana. It was built in 1982, so it is 43 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. Its operating status is: posted for load restriction.

It carries about 62 vehicles a day, roughly 3% of them trucks, projected to reach 66 by 2043. The structure is 48 ft (14.6 m) long and 20 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesGravley RD
CrossesRed Rock River 085
Location4M NW Lima
RouteCounty Highway 1265
StateMontana
Coordinates44.69338, -112.6538
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating5 US tons
Inventory rating5 US tons

Structure

MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length48 ft (14.6 m)
Longest span42 ft (12.8 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic62 (2023)
Projected traffic66 by 2043
Trucks3%
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$170,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Gravley RD over Red Rock River 085 built?

It was built in 1982, making it 43 years old in 2025.

What condition is Gravley RD over Red Rock River 085 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 2024.

How much traffic does Gravley RD over Red Rock River 085 carry?

About 62 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Gravley RD over Red Rock River 085?

The structure is 48 ft (14.6 m) long with a longest span of 42 ft (12.8 m) and a deck 20 ft wide.

Who owns Gravley RD over Red Rock River 085?

It is owned by the County Highway Agency.