US Bridges

28th Avenue over Sweet Briar Creek

Good

Morton County, North Dakota · 6 West 1 South of Mandan · Structure no. 000000030150121

Built
2012
13 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
112 ft
1 main span
Daily traffic
20
2019 count
Owner
County
County Highway Agency

About this bridge

28th Avenue over Sweet Briar Creek is a prestressed concrete box beam or girders - multiple carrying 28th Avenue over Sweet Briar Creek in Morton County, North Dakota. It was built in 2012, so it is 13 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 20 vehicles a day, projected to reach 5 by 2039. The structure is 112 ft (34.1 m) long and 30 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Carries28th Avenue
CrossesSweet Briar Creek
Location6 West 1 South of Mandan
RouteCounty Highway 0
Coordinates46.80801, -101.04956
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 inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.4 US tons
Inventory rating46.4 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHL 93
Structure length112 ft (34.1 m)
Longest span112 ft (34.1 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2019)
Projected traffic5 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$272,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 28th Avenue over Sweet Briar Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is 28th Avenue over Sweet Briar 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 April 2023.

How much traffic does 28th Avenue over Sweet Briar Creek carry?

About 20 vehicles per day (2019 count).

How long is 28th Avenue over Sweet Briar Creek?

The structure is 112 ft (34.1 m) long with a longest span of 112 ft (34.1 m) and a deck 30 ft wide.

Who owns 28th Avenue over Sweet Briar Creek?

It is owned by the County Highway Agency.