US Bridges

US016A over Grace Coolidge Ck

Good

Custer County, South Dakota · 0.1 N JCT Sd 36 E · Structure no. 000000017358065

Built
1986
39 years old
Condition
Good
inspected November 2022
Type
Slab
Concrete Continuous
Length
70 ft
3 main spans
Daily traffic
625
2024 count
Owner
State
State Highway Agency

About this bridge

US016A over Grace Coolidge Ck is a concrete continuous slab carrying US016A over Grace Coolidge Ck in Custer County, South Dakota. It was built in 1986, so it is 39 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 625 vehicles a day, roughly 4% of them trucks, projected to reach 1,019 by 2044. The structure is 70 ft (21.3 m) long and 35 ft wide. If it were closed, the detour would be 24.2 mi (39 km).

CarriesUS016A
CrossesGrace Coolidge Ck
Location0.1 N JCT Sd 36 E
RouteU.S. Route 16
Coordinates43.77323, -103.33967
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating65.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length70 ft (21.3 m)
Longest span27 ft (8.2 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic625 (2024)
Projected traffic1,019 by 2044
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.2 mi (39 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 1986, making it 39 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 November 2022.

How much traffic does US016A over Grace Coolidge Ck carry?

About 625 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is US016A over Grace Coolidge Ck?

The structure is 70 ft (21.3 m) long with a longest span of 27 ft (8.2 m) and a deck 35 ft wide.

Who owns US016A over Grace Coolidge Ck?

It is owned by the State Highway Agency.