US Bridges

US016A over Grace Coolidge Ck

Fair

Custer County, South Dakota · 5.5 E JCT Sd 87 N · Structure no. 000000017338072

Built
1988
37 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
38 ft
3 main spans
Daily traffic
1,562
2024 count
Owner
State
State Highway Agency

About this bridge

US016A over Grace Coolidge Ck is a concrete continuous culvert carrying US016A over Grace Coolidge Ck in Custer County, South Dakota. It was built in 1988, so it is 37 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 6 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 1,562 vehicles a day, roughly 3% of them trucks, projected to reach 2,548 by 2044. The structure is 38 ft (11.5 m) long. If it were closed, the detour would be 37.9 mi (61 km).

CarriesUS016A
CrossesGrace Coolidge Ck
Location5.5 E JCT Sd 87 N
RouteU.S. Route 16
Coordinates43.76491, -103.38319
Functional classRural Minor Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length38 ft (11.5 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,562 (2024)
Projected traffic2,548 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed37.9 mi (61 km)
TollOn a free road
National Highway SystemNo

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 US016A over Grace Coolidge Ck built?

It was built in 1988, making it 37 years old in 2025.

What condition is US016A over Grace Coolidge Ck 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 March 2023.

How much traffic does US016A over Grace Coolidge Ck carry?

About 1,562 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is US016A over Grace Coolidge Ck?

The structure is 38 ft (11.5 m) long with a longest span of 12 ft (3.7 m).

Who owns US016A over Grace Coolidge Ck?

It is owned by the State Highway Agency.