US Bridges

County Highway over Little Muddy River

Fair

Williams County, North Dakota · 4 South Alamo · Structure no. 000000053127090

Built
1920
105 years old, rebuilt 1950
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
100
2020 count
Owner
County
County Highway Agency

About this bridge

County Highway over Little Muddy River is a steel stringer/multi-beam or girder carrying County Highway over Little Muddy River in Williams County, North Dakota. It was built in 1920 and reconstructed in 1950, so it is 105 years old, older than the North Dakota average of 48.2 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 12% of them trucks, projected to reach 100 by 2040. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Highway
CrossesLittle Muddy River
Location4 South Alamo
RouteCounty Highway 0
CountyWilliams County
StateNorth Dakota
Coordinates48.5116, -103.47231
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating47.4 US tons
Inventory rating28.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2020)
Projected traffic100 by 2040
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was County Highway over Little Muddy River built?

It was built in 1920, making it 105 years old in 2025. It was reconstructed in 1950.

What condition is County Highway over Little Muddy River 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 July 2023.

How much traffic does County Highway over Little Muddy River carry?

About 100 vehicles per day (2020 count), of which roughly 12% are trucks.

How long is County Highway over Little Muddy River?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 24 ft wide.

Who owns County Highway over Little Muddy River?

It is owned by the County Highway Agency.