US Bridges

Lower RD over Muster Creek 001

Fair

Custer County, Montana · 1M SW Kinsey · Structure no. L09016003+03001

Built
1994
31 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
96 ft
6 main spans
Daily traffic
100
2025 count
Owner
County
County Highway Agency

About this bridge

Lower RD over Muster Creek 001 is a steel stringer/multi-beam or girder carrying Lower RD over Muster Creek 001 in Custer County, Montana. It was built in 1994, so it is 31 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 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 96 ft (29.3 m) long and 24 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesLower RD
CrossesMuster Creek 001
Location1M SW Kinsey
RouteCounty Highway 9016
CountyCuster County
StateMontana
Coordinates46.56199, -105.66734
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75 US tons
Inventory rating57 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckCorrugated steel
Main spans6
Design loadHS 20
Structure length96 ft (29.3 m)
Longest span16 ft (4.9 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 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 closed8.1 mi (13 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lower RD over Muster Creek 001 built?

It was built in 1994, making it 31 years old in 2025.

What condition is Lower RD over Muster Creek 001 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 Lower RD over Muster Creek 001 carry?

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

How long is Lower RD over Muster Creek 001?

The structure is 96 ft (29.3 m) long with a longest span of 16 ft (4.9 m) and a deck 24 ft wide.

Who owns Lower RD over Muster Creek 001?

It is owned by the County Highway Agency.