US Bridges

Selkirk RD over Martinsdale Res Spwy 021

Fair

Wheatland County, Montana · 8M W Two DOT · Structure no. L54016002+08001

Built
1976
49 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Concrete
Length
25 ft
1 main span
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Selkirk RD over Martinsdale Res Spwy 021 is a concrete tee beam carrying Selkirk RD over Martinsdale Res Spwy 021 in Wheatland County, Montana. It was built in 1976, so it is 49 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.

It carries about 100 vehicles a day, roughly 3% of them trucks, projected to reach 100 by 2040. The structure is 25 ft (7.6 m) long and 19 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesSelkirk RD
CrossesMartinsdale Res Spwy 021
Location8M W Two DOT
RouteCounty Highway 54003
CountyWheatland County
StateMontana
Coordinates46.45653, -110.2296
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.
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no 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 geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating42 US tons
Inventory rating33 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width19 ft (5.9 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2025)
Projected traffic100 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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$44,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Selkirk RD over Martinsdale Res Spwy 021 built?

It was built in 1976, making it 49 years old in 2025.

What condition is Selkirk RD over Martinsdale Res Spwy 021 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 September 2024.

How much traffic does Selkirk RD over Martinsdale Res Spwy 021 carry?

About 100 vehicles per day (2025 count), of which roughly 3% are trucks.

How long is Selkirk RD over Martinsdale Res Spwy 021?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 19 ft wide.

Who owns Selkirk RD over Martinsdale Res Spwy 021?

It is owned by the County Highway Agency.