US Bridges

Fdr 181 over Castle Creek

Good

Pennington County, South Dakota · T 1 N R 3 E Sec 2 · Structure no. 020306000010080

Built
1956
69 years old, rebuilt 1985
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
23 ft
1 main span
Daily traffic
25
1991 count
Owner
Federal
U.S. Forest Service

About this bridge

Fdr 181 over Castle Creek is a wood or timber stringer/multi-beam or girder carrying Fdr 181 over Castle Creek in Pennington County, South Dakota. It was built in 1956 and reconstructed in 1985, so it is 69 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 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 37 by 2045. The structure is 23 ft (6.9 m) long and 15 ft wide. If it were closed, the detour would be 7.5 mi (12 km).

CarriesFdr 181
CrossesCastle Creek
LocationT 1 N R 3 E Sec 2
RouteFederal Lands Road 181
Coordinates44.08125, -103.72615
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating50 US tons
Inventory rating38.6 US tons

Structure

MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 20
Structure length23 ft (6.9 m)
Longest span21 ft (6.4 m)
Deck width15 ft (4.6 m)
Roadway width14 ft (4.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (1991)
Projected traffic37 by 2045
Trucks—
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed7.5 mi (12 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Fdr 181 over Castle Creek built?

It was built in 1956, making it 69 years old in 2025. It was reconstructed in 1985.

What condition is Fdr 181 over Castle 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 2024.

How much traffic does Fdr 181 over Castle Creek carry?

About 25 vehicles per day (1991 count).

How long is Fdr 181 over Castle Creek?

The structure is 23 ft (6.9 m) long with a longest span of 21 ft (6.4 m) and a deck 15 ft wide.

Who owns Fdr 181 over Castle Creek?

It is owned by the U.S. Forest Service.