US Bridges

12th ST SE over Maple River

FairPosted for load

Steele County, North Dakota · 3 West of Colgate · Structure no. 000000046113300

Built
1950
75 years old, rebuilt 2008
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
30 ft
1 main span
Daily traffic
34
2022 count
Owner
County
County Highway Agency

About this bridge

12th ST SE over Maple River is a steel stringer/multi-beam or girder carrying 12th ST SE over Maple River in Steele County, North Dakota. It was built in 1950 and reconstructed in 2008, so it is 75 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. Its operating status is: posted for load restriction.

It carries about 34 vehicles a day, projected to reach 30 by 2037. The structure is 30 ft (9.1 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries12th ST SE
CrossesMaple River
Location3 West of Colgate
RouteCounty Highway 0
CountySteele County
StateNorth Dakota
Coordinates47.24009, -97.72238
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.
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 inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation4: Meets minimum tolerable limits to be 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 alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating22.6 US tons
Inventory rating13.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckWood or timber
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span28 ft (8.5 m)
Deck width21 ft (6.3 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic34 (2022)
Projected traffic30 by 2037
Trucks—
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 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 12th ST SE over Maple River built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2008.

What condition is 12th ST SE over Maple 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 August 2023.

How much traffic does 12th ST SE over Maple River carry?

About 34 vehicles per day (2022 count).

How long is 12th ST SE over Maple River?

The structure is 30 ft (9.1 m) long with a longest span of 28 ft (8.5 m) and a deck 21 ft wide.

Who owns 12th ST SE over Maple River?

It is owned by the County Highway Agency.