US Bridges

89th Ave SW over Timber Creek

FairPosted for load

Hettinger County, North Dakota · 9 South 3 East of Mott · Structure no. 000000021133290

Built
1946
79 years old, rebuilt 1970
Condition
Fair
inspected September 2024
Type
Slab
Wood or Timber
Length
32 ft
1 main span
Daily traffic
20
2018 count
Owner
County
County Highway Agency

About this bridge

89th Ave SW over Timber Creek is a wood or timber slab carrying 89th Ave SW over Timber Creek in Hettinger County, North Dakota. It was built in 1946 and reconstructed in 1970, so it is 79 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 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 20 vehicles a day, projected to reach 20 by 2038. The structure is 32 ft (9.8 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
Carries89th Ave SW
CrossesTimber Creek
Location9 South 3 East of Mott
RouteCounty Highway 0
CountyHettinger County
StateNorth Dakota
Coordinates46.23288, -102.22743
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating14.7 US tons
Inventory rating10 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span29 ft (8.8 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2018)
Projected traffic20 by 2038
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$203,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 89th Ave SW over Timber Creek built?

It was built in 1946, making it 79 years old in 2025. It was reconstructed in 1970.

What condition is 89th Ave SW over Timber Creek 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 89th Ave SW over Timber Creek carry?

About 20 vehicles per day (2018 count).

How long is 89th Ave SW over Timber Creek?

The structure is 32 ft (9.8 m) long with a longest span of 29 ft (8.8 m) and a deck 23 ft wide.

Who owns 89th Ave SW over Timber Creek?

It is owned by the County Highway Agency.