US Bridges

71st ST SW over Chanta Peta Creek

Good

Slope County, North Dakota · 7 South 18 East of Amidon · Structure no. 000000044153170

Built
1985
40 years old
Condition
Good
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
50
2018 count
Owner
County
County Highway Agency

About this bridge

71st ST SW over Chanta Peta Creek is a prestressed concrete box beam or girders - single or spread carrying 71st ST SW over Chanta Peta Creek in Slope County, North Dakota. It was built in 1985, so it is 40 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 good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, projected to reach 40 by 2038. The structure is 66 ft (20.1 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Carries71st ST SW
CrossesChanta Peta Creek
Location7 South 18 East of Amidon
RouteCounty Highway 0
Coordinates46.38332, -102.94616
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating52.9 US tons
Inventory rating26.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length66 ft (20.1 m)
Longest span62 ft (18.9 m)
Deck width32 ft (9.9 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2018)
Projected traffic40 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 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 71st ST SW over Chanta Peta Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is 71st ST SW over Chanta Peta Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in August 2023.

How much traffic does 71st ST SW over Chanta Peta Creek carry?

About 50 vehicles per day (2018 count).

How long is 71st ST SW over Chanta Peta Creek?

The structure is 66 ft (20.1 m) long with a longest span of 62 ft (18.9 m) and a deck 32 ft wide.

Who owns 71st ST SW over Chanta Peta Creek?

It is owned by the County Highway Agency.