US Bridges

169th Ave. SW over Sevenmile Creek

PoorPosted for load

Bowman County, North Dakota · 17 South 3 East Marmarth · Structure no. 000000006109160

Built
1970
55 years old
Condition
Poor
inspected October 2024
Type
Channel Beam
Concrete
Length
31 ft
1 main span
Daily traffic
25
2019 count
Owner
County
County Highway Agency

About this bridge

169th Ave. SW over Sevenmile Creek is a concrete channel beam carrying 169th Ave. 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 poor condition with a lowest component rating of 4 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 25 vehicles a day, projected to reach 30 by 2039. The structure is 31 ft (9.4 m) long and 25 ft wide. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
Carries169th Ave. SW
CrossesSevenmile Creek
Location17 South 3 East Marmarth
RouteCounty Highway 0
CountyBowman County
StateNorth Dakota
Coordinates46.05823, -103.88626
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
Deck7 GoodSome minor problems.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating24.4 US tons
Inventory rating14.7 US tons

Structure

Structure typeChannel Beam
MaterialConcrete
DeckOther
Main spans1
Design loadH 20
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2019)
Projected traffic30 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 169th Ave. SW over Sevenmile Creek built?

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

What condition is 169th Ave. SW over Sevenmile 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 169th Ave. SW over Sevenmile Creek carry?

About 25 vehicles per day (2019 count).

How long is 169th Ave. SW over Sevenmile Creek?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 25 ft wide.

Who owns 169th Ave. SW over Sevenmile Creek?

It is owned by the County Highway Agency.