US Bridges

Snoma Road over Redwater Canal

Fair

Butte County, South Dakota · 1 MI East Belle F. · Structure no. 000000010115379

Built
1975
50 years old
Condition
Fair
inspected August 2024
Type
Tee Beam
Prestressed Concrete
Length
25 ft
1 main span
Daily traffic
150
2022 count
Owner
County
County Highway Agency

About this bridge

Snoma Road over Redwater Canal is a prestressed concrete tee beam carrying Snoma Road over Redwater Canal in Butte County, South Dakota. It was built in 1975, so it is 50 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 5 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 150 vehicles a day, roughly 3% of them trucks, projected to reach 150 by 2032. The structure is 25 ft (7.6 m) long and 27 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSnoma Road
CrossesRedwater Canal
Location1 MI East Belle F.
RouteCounty Highway 0
CountyButte County
StateSouth Dakota
Coordinates44.66263, -103.82174
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72.6 US tons
Inventory rating43.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width27 ft (8.3 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2022)
Projected traffic150 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Snoma Road over Redwater Canal built?

It was built in 1975, making it 50 years old in 2025.

What condition is Snoma Road over Redwater Canal 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 August 2024.

How much traffic does Snoma Road over Redwater Canal carry?

About 150 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Snoma Road over Redwater Canal?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m) and a deck 27 ft wide.

Who owns Snoma Road over Redwater Canal?

It is owned by the County Highway Agency.