US Bridges

Shippe Canyon RD over Big Muddy Creek 032

Fair

Sheridan County, Montana · 2M S Plentywood · Structure no. L46404001+04001

Built
1970
55 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
117
2023 count
Owner
County
County Highway Agency

About this bridge

Shippe Canyon RD over Big Muddy Creek 032 is a prestressed concrete tee beam carrying Shippe Canyon RD over Big Muddy Creek 032 in Sheridan County, Montana. It was built in 1970, so it is 55 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 117 vehicles a day, projected to reach 123 by 2043. The structure is 62 ft (18.9 m) long and 24 ft wide. If it were closed, the detour would be 23 mi (37 km).

Location

Open in Google Maps
CarriesShippe Canyon RD
CrossesBig Muddy Creek 032
Location2M S Plentywood
RouteCounty Highway 46404
CountySheridan County
StateMontana
Coordinates48.75004, -104.54924
Functional classRural Minor Collector

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 inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
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 adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating30 US tons
Inventory rating23.9 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width24 ft (7.3 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic117 (2023)
Projected traffic123 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed23 mi (37 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 Shippe Canyon RD over Big Muddy Creek 032 built?

It was built in 1970, making it 55 years old in 2025.

What condition is Shippe Canyon RD over Big Muddy Creek 032 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 January 2024.

How much traffic does Shippe Canyon RD over Big Muddy Creek 032 carry?

About 117 vehicles per day (2023 count).

How long is Shippe Canyon RD over Big Muddy Creek 032?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 24 ft wide.

Who owns Shippe Canyon RD over Big Muddy Creek 032?

It is owned by the County Highway Agency.