US Bridges

Old Muddy RD over Big Muddy Creek 033

Fair

Sheridan County, Montana · 1M NW Antelope · Structure no. L46418000+09001

Built
1987
38 years old
Condition
Fair
inspected January 2024
Type
Tee Beam
Prestressed Concrete
Length
56 ft
1 main span
Daily traffic
13
2023 count
Owner
County
County Highway Agency

About this bridge

Old Muddy RD over Big Muddy Creek 033 is a prestressed concrete tee beam carrying Old Muddy RD over Big Muddy Creek 033 in Sheridan County, Montana. It was built in 1987, so it is 38 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.

It carries about 13 vehicles a day, roughly 3% of them trucks, projected to reach 14 by 2043. The structure is 56 ft (17.1 m) long and 26 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

CarriesOld Muddy RD
CrossesBig Muddy Creek 033
Location1M NW Antelope
RouteCounty Highway 46418
StateMontana
Coordinates48.70786, -104.47558
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span55 ft (16.8 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13 (2023)
Projected traffic14 by 2043
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed9.9 mi (16 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 Old Muddy RD over Big Muddy Creek 033 built?

It was built in 1987, making it 38 years old in 2025.

What condition is Old Muddy RD over Big Muddy Creek 033 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 Old Muddy RD over Big Muddy Creek 033 carry?

About 13 vehicles per day (2023 count), of which roughly 3% are trucks.

How long is Old Muddy RD over Big Muddy Creek 033?

The structure is 56 ft (17.1 m) long with a longest span of 55 ft (16.8 m) and a deck 26 ft wide.

Who owns Old Muddy RD over Big Muddy Creek 033?

It is owned by the County Highway Agency.