US Bridges

Old Sawmill Road over Mickelson Trail

Good

Custer County, South Dakota · 1.0 South of Custer · Structure no. 000000017226094

Built
2009
16 years old
Condition
Good
inspected April 2023
Type
Channel Beam
Prestressed Concrete
Length
68 ft
1 main span
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

Old Sawmill Road over Mickelson Trail is a prestressed concrete channel beam carrying Old Sawmill Road over Mickelson Trail in Custer County, South Dakota. It was built in 2009, so it is 16 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 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 50 vehicles a day, roughly 2% of them trucks, projected to reach 50 by 2032. The structure is 68 ft (20.7 m) long and 31 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

CarriesOld Sawmill Road
CrossesMickelson Trail
Location1.0 South of Custer
RouteCounty Highway 0
Coordinates43.73254, -103.60602
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeChannel Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length68 ft (20.7 m)
Longest span64 ft (19.5 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic50 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesPedestrian / bicycle
Detour if closed14.9 mi (24 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Old Sawmill Road over Mickelson Trail built?

It was built in 2009, making it 16 years old in 2025.

What condition is Old Sawmill Road over Mickelson Trail 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 April 2023.

How much traffic does Old Sawmill Road over Mickelson Trail carry?

About 50 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is Old Sawmill Road over Mickelson Trail?

The structure is 68 ft (20.7 m) long with a longest span of 64 ft (19.5 m) and a deck 31 ft wide.

Who owns Old Sawmill Road over Mickelson Trail?

It is owned by the County Highway Agency.