US Bridges

20th Ave SE over S Branch Beaver Creek

Fair

Emmons County, North Dakota · 9 East 3 North Strasburg · Structure no. 000000015131330

Built
1968
57 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
55 ft
1 main span
Daily traffic
52
2019 count
Owner
County
County Highway Agency

About this bridge

20th Ave SE over S Branch Beaver Creek is a prestressed concrete box beam or girders - multiple carrying 20th Ave SE over S Branch Beaver Creek in Emmons County, North Dakota. It was built in 1968, so it is 57 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 52 vehicles a day, projected to reach 60 by 2039. The structure is 55 ft (16.8 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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Carries20th Ave SE
CrossesS Branch Beaver Creek
Location9 East 3 North Strasburg
RouteCounty Highway 1529
CountyEmmons County
StateNorth Dakota
Coordinates46.16756, -99.96174
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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadUnknown
Structure length55 ft (16.8 m)
Longest span52 ft (15.8 m)
Deck width30 ft (9.2 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic52 (2019)
Projected traffic60 by 2039
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$63,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 20th Ave SE over S Branch Beaver Creek built?

It was built in 1968, making it 57 years old in 2025.

What condition is 20th Ave SE over S Branch Beaver 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 20th Ave SE over S Branch Beaver Creek carry?

About 52 vehicles per day (2019 count).

How long is 20th Ave SE over S Branch Beaver Creek?

The structure is 55 ft (16.8 m) long with a longest span of 52 ft (15.8 m) and a deck 30 ft wide.

Who owns 20th Ave SE over S Branch Beaver Creek?

It is owned by the County Highway Agency.