US Bridges

US385 over Blair Ck

Good

Fall River County, South Dakota · 7.3 S JCT US 18 E · Structure no. 000000024420273

Built
2013
12 years old
Condition
Good
inspected May 2024
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
673
2023 count
Owner
State
State Highway Agency

About this bridge

US385 over Blair Ck is a concrete culvert carrying US385 over Blair Ck in Fall River County, South Dakota. It was built in 2013, so it is 12 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 673 vehicles a day, roughly 21% of them trucks, projected to reach 853 by 2043. The structure is 23 ft (6.9 m) long. If it were closed, the detour would be 98.8 mi (159 km).

CarriesUS385
CrossesBlair Ck
Location7.3 S JCT US 18 E
RouteU.S. Route 385
Coordinates43.08102, -103.22836
Functional classRural Principal Arterial - Other

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection9 ExcellentNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment9: Superior to present desirable criteria
Operating rating38.9 US tons
Inventory rating30.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHL 93
Structure length23 ft (6.9 m)
Longest span11 ft (3.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic673 (2023)
Projected traffic853 by 2043
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 US385 over Blair Ck built?

It was built in 2013, making it 12 years old in 2025.

What condition is US385 over Blair Ck 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 May 2024.

How much traffic does US385 over Blair Ck carry?

About 673 vehicles per day (2023 count), of which roughly 21% are trucks.

How long is US385 over Blair Ck?

The structure is 23 ft (6.9 m) long with a longest span of 11 ft (3.4 m).

Who owns US385 over Blair Ck?

It is owned by the State Highway Agency.