US Bridges

Diversion Dam Road over Inlet Canal

Good

Butte County, South Dakota · 1.3 MI NE Belle Fourche · Structure no. 10-110-361

Built
1906
119 years old, rebuilt 1989
Condition
Good
inspected September 2023
Type
Channel Beam
Prestressed Concrete
Length
80 ft
2 main spans
Daily traffic
1
2017 count
Owner
Federal
Bureau of Reclamation

About this bridge

Diversion Dam Road over Inlet Canal is a prestressed concrete channel beam carrying Diversion Dam Road over Inlet Canal in Butte County, South Dakota. It was built in 1906 and reconstructed in 1989, so it is 119 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 1 vehicles a day, projected to reach 1 by 2044. The structure is 80 ft (24.5 m) long and 19 ft wide. If it were closed, the detour would be 198.8 mi (320 km).

Location

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CarriesDiversion Dam Road
CrossesInlet Canal
Location1.3 MI NE Belle Fourche
RouteFederal Lands Road 0
CountyButte County
StateSouth Dakota
Coordinates44.69071, -103.83093
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating44 US tons
Inventory rating34 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadHS 20
Structure length80 ft (24.5 m)
Longest span37 ft (11.4 m)
Deck width19 ft (5.9 m)
Roadway width17 ft (5.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1 (2017)
Projected traffic1 by 2044
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed198.8 mi (320 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Reclamation
Maintained byOther Local 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 Diversion Dam Road over Inlet Canal built?

It was built in 1906, making it 119 years old in 2025. It was reconstructed in 1989.

What condition is Diversion Dam Road over Inlet Canal 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 September 2023.

How much traffic does Diversion Dam Road over Inlet Canal carry?

About 1 vehicles per day (2017 count).

How long is Diversion Dam Road over Inlet Canal?

The structure is 80 ft (24.5 m) long with a longest span of 37 ft (11.4 m) and a deck 19 ft wide.

Who owns Diversion Dam Road over Inlet Canal?

It is owned by the Bureau of Reclamation and maintained by the Other Local Agency.