US Bridges

121st Ave SW over Green River

Fair

Dunn County, North Dakota · 5 West 2 North New Hradec · Structure no. 000000013105550

Built
2014
11 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
106 ft
1 main span
Daily traffic
50
2018 count
Owner
County
County Highway Agency

About this bridge

121st Ave SW over Green River is a prestressed concrete stringer/multi-beam or girder carrying 121st Ave SW over Green River in Dunn County, North Dakota. It was built in 2014, so it is 11 years old, younger 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.

It carries about 50 vehicles a day, projected to reach 110 by 2038. The structure is 106 ft (32.4 m) long and 35 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
Carries121st Ave SW
CrossesGreen River
Location5 West 2 North New Hradec
RouteCounty Highway 1307
CountyDunn County
StateNorth Dakota
Coordinates47.02224, -102.99047
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.3 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadH 20
Structure length106 ft (32.4 m)
Longest span106 ft (32.4 m)
Deck width35 ft (10.7 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic110 by 2038
Trucks0%
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 121st Ave SW over Green River built?

It was built in 2014, making it 11 years old in 2025.

What condition is 121st Ave SW over Green 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 June 2023.

How much traffic does 121st Ave SW over Green River carry?

About 50 vehicles per day (2018 count).

How long is 121st Ave SW over Green River?

The structure is 106 ft (32.4 m) long with a longest span of 106 ft (32.4 m) and a deck 35 ft wide.

Who owns 121st Ave SW over Green River?

It is owned by the County Highway Agency.