US Bridges

US016A over Grace Coolidge Ck

Good

Custer County, South Dakota · 4.2 E JCT Sd 87 N · Structure no. 000000017330064

Built
1988
37 years old
Condition
Good
inspected March 2023
Type
Culvert
Concrete Continuous
Length
49 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 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 1,562 vehicles a day, roughly 3% of them trucks, projected to reach 2,548 by 2044. The structure is 49 ft (14.8 m) long. If it were closed, the detour would be 37.9 mi (61 km).

CarriesUS016A
CrossesGrace Coolidge Ck
Location4.2 E JCT Sd 87 N
RouteU.S. Route 16
Coordinates43.7753, -103.39796
Functional classRural Minor Arterial

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 protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum 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 length49 ft (14.8 m)
Longest span16 ft (4.8 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 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 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 49 ft (14.8 m) long with a longest span of 16 ft (4.8 m).

Who owns US016A over Grace Coolidge Ck?

It is owned by the State Highway Agency.