US Bridges

IRR BIA RTE 7 over Buffalo Skin Creek

Good

Dewey County, South Dakota · 15.8 KM North of US-212 · Structure no. 0000A01340B0131

Built
2013
12 years old
Condition
Good
inspected May 2023
Type
Tee Beam
Prestressed Concrete
Length
76 ft
1 main span
Daily traffic
77
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE 7 over Buffalo Skin Creek is a prestressed concrete tee beam carrying IRR BIA RTE 7 over Buffalo Skin Creek in Dewey County, South Dakota. It was built in 2013, so it is 12 years old, younger than the South Dakota average of 48.9 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 77 vehicles a day, roughly 5% of them trucks, projected to reach 90 by 2043. The structure is 76 ft (23.2 m) long and 33 ft wide. If it were closed, the detour would be 52.8 mi (85 km).

CarriesIRR BIA RTE 7
CrossesBuffalo Skin Creek
Location15.8 KM North of US-212
RouteFederal Lands Road 7
Coordinates45.12903, -100.39669
Functional classRural Minor Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating49.3 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length76 ft (23.2 m)
Longest span74 ft (22.6 m)
Deck width33 ft (10 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic77 (2023)
Projected traffic90 by 2043
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed52.8 mi (85 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was IRR BIA RTE 7 over Buffalo Skin Creek built?

It was built in 2013, making it 12 years old in 2025.

What condition is IRR BIA RTE 7 over Buffalo Skin 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 May 2023.

How much traffic does IRR BIA RTE 7 over Buffalo Skin Creek carry?

About 77 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is IRR BIA RTE 7 over Buffalo Skin Creek?

The structure is 76 ft (23.2 m) long with a longest span of 74 ft (22.6 m) and a deck 33 ft wide.

Who owns IRR BIA RTE 7 over Buffalo Skin Creek?

It is owned by the Bureau of Indian Affairs.