US Bridges

94th Avenue SW over Thirty Mile Creek

PoorPosted for load

Hettinger County, North Dakota · 12 North 3 West of Mott · Structure no. 000000021126060

Built
1941
84 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
15
2018 count
Owner
County
County Highway Agency

About this bridge

94th Avenue SW over Thirty Mile Creek is a steel stringer/multi-beam or girder carrying 94th Avenue SW over Thirty Mile Creek in Hettinger County, North Dakota. It was built in 1941, so it is 84 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 15 vehicles a day, projected to reach 20 by 2038. The structure is 33 ft (10.1 m) long and 18 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Carries94th Avenue SW
CrossesThirty Mile Creek
Location12 North 3 West of Mott
RouteCounty Highway 0
Coordinates46.55571, -102.38124
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating6.8 US tons
Inventory rating3.9 US tons

Structure

MaterialSteel
DeckWood or timber
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width18 ft (5.6 m)
Roadway width17 ft (5.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15 (2018)
Projected traffic20 by 2038
Trucks—
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 statusPossibly eligible for the National Register; requires further investigation
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$204,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 94th Avenue SW over Thirty Mile Creek built?

It was built in 1941, making it 84 years old in 2025.

What condition is 94th Avenue SW over Thirty Mile Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does 94th Avenue SW over Thirty Mile Creek carry?

About 15 vehicles per day (2018 count).

How long is 94th Avenue SW over Thirty Mile Creek?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 18 ft wide.

Who owns 94th Avenue SW over Thirty Mile Creek?

It is owned by the County Highway Agency.