US Bridges

State Highway 514 over Oahe Dam Discharge Chan.

Fair

Stanley County, South Dakota · 5 Miles No. of Ft. Pierre · Structure no. CEPMROSD0000009

Built
1957
68 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
607 ft
4 main spans
Daily traffic
300
2015 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

State Highway 514 over Oahe Dam Discharge Chan. is a steel stringer/multi-beam or girder carrying State Highway 514 over Oahe Dam Discharge Chan. in Stanley County, South Dakota. It was built in 1957, so it is 68 years old, older than the South Dakota average of 48.9 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 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 300 vehicles a day, roughly 6% of them trucks, projected to reach 420 by 2042. The structure is 607 ft (185 m) long and 32 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesState Highway 514
CrossesOahe Dam Discharge Chan.
Location5 Miles No. of Ft. Pierre
RouteState Highway 514
CountyStanley County
StateSouth Dakota
Coordinates44.43177, -100.39913
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating50.7 US tons
Inventory rating38.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadRailroad
Structure length607 ft (185 m)
Longest span154 ft (46.9 m)
Deck width32 ft (9.8 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2015)
Projected traffic420 by 2042
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$2.1 million (2023 estimate)
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was State Highway 514 over Oahe Dam Discharge Chan. built?

It was built in 1957, making it 68 years old in 2025.

What condition is State Highway 514 over Oahe Dam Discharge Chan. 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 September 2023.

How much traffic does State Highway 514 over Oahe Dam Discharge Chan. carry?

About 300 vehicles per day (2015 count), of which roughly 6% are trucks.

How long is State Highway 514 over Oahe Dam Discharge Chan.?

The structure is 607 ft (185 m) long with a longest span of 154 ft (46.9 m) and a deck 32 ft wide.

Who owns State Highway 514 over Oahe Dam Discharge Chan.?

It is owned by the Corps of Engineers (Civil).