US Bridges

108th Ave. over Redwater Rv

FairPosted for load

Lawrence County, South Dakota · 1W 6.5N Spearfish · Structure no. 000000041079006

Built
2008
17 years old
Condition
Fair
inspected July 2024
Type
Slab
Prestressed Concrete
Length
39 ft
1 main span
Daily traffic
48
2022 count
Owner
County
County Highway Agency

About this bridge

108th Ave. over Redwater Rv is a prestressed concrete slab carrying 108th Ave. over Redwater Rv in Lawrence County, South Dakota. It was built in 2008, so it is 17 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 48 vehicles a day, roughly 2% of them trucks, projected to reach 48 by 2032. The structure is 39 ft (12 m) long and 18 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries108th Ave.
CrossesRedwater Rv
Location1W 6.5N Spearfish
RouteCounty Highway 0
CountyLawrence County
StateSouth Dakota
Coordinates44.59541, -103.89065
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating37.7 US tons
Inventory rating22.5 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length39 ft (12 m)
Longest span35 ft (10.6 m)
Deck width18 ft (5.6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic48 (2022)
Projected traffic48 by 2032
Trucks2%
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

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 108th Ave. over Redwater Rv built?

It was built in 2008, making it 17 years old in 2025.

What condition is 108th Ave. over Redwater Rv 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 July 2024.

How much traffic does 108th Ave. over Redwater Rv carry?

About 48 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 108th Ave. over Redwater Rv?

The structure is 39 ft (12 m) long with a longest span of 35 ft (10.6 m) and a deck 18 ft wide.

Who owns 108th Ave. over Redwater Rv?

It is owned by the County Highway Agency.