US Bridges

30th Ave SW over Square Butte Creek

Good

Oliver County, North Dakota · 8 East 4 South of Center · Structure no. 000000033130170

Built
1981
44 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
94 ft
1 main span
Daily traffic
27
2022 count
Owner
County
County Highway Agency

About this bridge

30th Ave SW over Square Butte Creek is a prestressed concrete box beam or girders - single or spread carrying 30th Ave SW over Square Butte Creek in Oliver County, North Dakota. It was built in 1981, so it is 44 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 27 vehicles a day, projected to reach 37 by 2042. The structure is 94 ft (28.7 m) long and 31 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries30th Ave SW
CrossesSquare Butte Creek
Location8 East 4 South of Center
RouteCounty Highway 0
CountyOliver County
StateNorth Dakota
Coordinates47.06116, -101.13265
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
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating41.7 US tons
Inventory rating10.4 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length94 ft (28.7 m)
Longest span90 ft (27.4 m)
Deck width31 ft (9.3 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27 (2022)
Projected traffic37 by 2042
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$108,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 30th Ave SW over Square Butte Creek built?

It was built in 1981, making it 44 years old in 2025.

What condition is 30th Ave SW over Square Butte 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 July 2023.

How much traffic does 30th Ave SW over Square Butte Creek carry?

About 27 vehicles per day (2022 count).

How long is 30th Ave SW over Square Butte Creek?

The structure is 94 ft (28.7 m) long with a longest span of 90 ft (27.4 m) and a deck 31 ft wide.

Who owns 30th Ave SW over Square Butte Creek?

It is owned by the County Highway Agency.