US Bridges

99th ST SW over Lightning Creek

Good

Bowman County, North Dakota · 11 South 6 East Scranton · Structure no. 000000006150200

Built
1987
38 years old
Condition
Good
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
65 ft
1 main span
Daily traffic
25
2019 count
Owner
County
County Highway Agency

About this bridge

99th ST SW over Lightning Creek is a prestressed concrete box beam or girders - single or spread carrying 99th ST SW over Lightning Creek in Bowman County, North Dakota. It was built in 1987, so it is 38 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 25 vehicles a day, projected to reach 25 by 2039. The structure is 65 ft (19.8 m) long and 30 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Carries99th ST SW
CrossesLightning Creek
Location11 South 6 East Scranton
RouteCounty Highway 0
Coordinates45.98861, -103.01727
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.1 US tons
Inventory rating37.4 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span63 ft (19.2 m)
Deck width30 ft (9.2 m)
Roadway width28 ft (8.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2019)
Projected traffic25 by 2039
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 99th ST SW over Lightning Creek built?

It was built in 1987, making it 38 years old in 2025.

What condition is 99th ST SW over Lightning 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 October 2023.

How much traffic does 99th ST SW over Lightning Creek carry?

About 25 vehicles per day (2019 count).

How long is 99th ST SW over Lightning Creek?

The structure is 65 ft (19.8 m) long with a longest span of 63 ft (19.2 m) and a deck 30 ft wide.

Who owns 99th ST SW over Lightning Creek?

It is owned by the County Highway Agency.