US Bridges

Fdr 181 over Castle Creek

Fair

Pennington County, South Dakota · T 1 N R 3 E Sec 2 · Structure no. 020306000010018

Built
2004
21 years old
Condition
Fair
inspected May 2024
Type
Slab
Wood or Timber
Length
24 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 slab carrying Fdr 181 over Castle Creek in Pennington County, South Dakota. It was built in 2004, so it is 21 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 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 25 vehicles a day, projected to reach 37 by 2045. The structure is 24 ft (7.3 m) long and 16 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
Coordinates44.0778, -103.73065
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating47.8 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans1
Design loadHS 25 or greater
Structure length24 ft (7.3 m)
Longest span23 ft (7 m)
Deck width16 ft (4.9 m)
Roadway width14 ft (4.3 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 2004, making it 21 years old in 2025.

What condition is Fdr 181 over Castle Creek 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 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 24 ft (7.3 m) long with a longest span of 23 ft (7 m) and a deck 16 ft wide.

Who owns Fdr 181 over Castle Creek?

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