US Bridges

Sage Creek RD over Red Rock River 034

FairPosted for load

Beaverhead County, Montana · 1M N Dell · Structure no. L01251000+06001

Built
1977
48 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
71
2023 count
Owner
County
County Highway Agency

About this bridge

Sage Creek RD over Red Rock River 034 is a steel stringer/multi-beam or girder carrying Sage Creek RD over Red Rock River 034 in Beaverhead County, Montana. It was built in 1977, so it is 48 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. Its operating status is: posted for load restriction.

It carries about 71 vehicles a day, roughly 3% of them trucks, projected to reach 76 by 2043. The structure is 40 ft (12.2 m) long and 20 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesSage Creek RD
CrossesRed Rock River 034
Location1M N Dell
RouteCounty Highway 1251
CountyBeaverhead County
StateMontana
Coordinates44.73263, -112.69215
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating5 US tons
Inventory rating5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span33 ft (10.1 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic71 (2023)
Projected traffic76 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$137,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Sage Creek RD over Red Rock River 034 built?

It was built in 1977, making it 48 years old in 2025.

What condition is Sage Creek RD over Red Rock River 034 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 April 2023.

How much traffic does Sage Creek RD over Red Rock River 034 carry?

About 71 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Sage Creek RD over Red Rock River 034?

The structure is 40 ft (12.2 m) long with a longest span of 33 ft (10.1 m) and a deck 20 ft wide.

Who owns Sage Creek RD over Red Rock River 034?

It is owned by the County Highway Agency.