US Bridges

97th ST SW over Sevenmile Creek

Fair

Bowman County, North Dakota · 20 South 6 East Marmarth · Structure no. 000000006112190

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Channel Beam
Concrete
Length
26 ft
1 main span
Daily traffic
10
2019 count
Owner
County
County Highway Agency

About this bridge

97th ST SW over Sevenmile Creek is a concrete channel beam carrying 97th ST SW over Sevenmile Creek in Bowman County, North Dakota. It was built in 1970, so it is 55 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 10 vehicles a day, projected to reach 20 by 2039. The structure is 26 ft (7.8 m) long and 26 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
Carries97th ST SW
CrossesSevenmile Creek
Location20 South 6 East Marmarth
RouteCounty Highway 0
CountyBowman County
StateNorth Dakota
Coordinates46.0135, -103.81822
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78.2 US tons
Inventory rating44 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadH 20
Structure length26 ft (7.8 m)
Longest span24 ft (7.3 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10 (2019)
Projected traffic20 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 97th ST SW over Sevenmile Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is 97th ST SW over Sevenmile 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 October 2023.

How much traffic does 97th ST SW over Sevenmile Creek carry?

About 10 vehicles per day (2019 count).

How long is 97th ST SW over Sevenmile Creek?

The structure is 26 ft (7.8 m) long with a longest span of 24 ft (7.3 m) and a deck 26 ft wide.

Who owns 97th ST SW over Sevenmile Creek?

It is owned by the County Highway Agency.