US Bridges

SD036 over Grace Coolidge Ck

Good

Custer County, South Dakota · 0.3 E JCT US 16A · Structure no. 000000017363066

Built
1989
36 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete Continuous
Length
65 ft
3 main spans
Daily traffic
955
2024 count
Owner
State
State Highway Agency

About this bridge

SD036 over Grace Coolidge Ck is a concrete continuous culvert carrying SD036 over Grace Coolidge Ck in Custer County, South Dakota. It was built in 1989, so it is 36 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 955 vehicles a day, roughly 3% of them trucks, projected to reach 1,558 by 2044. The structure is 65 ft (19.8 m) long. If it were closed, the detour would be 34.2 mi (55 km).

CarriesSD036
CrossesGrace Coolidge Ck
Location0.3 E JCT US 16A
RouteState Highway 36
Coordinates43.77174, -103.33362
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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length65 ft (19.8 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic955 (2024)
Projected traffic1,558 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed34.2 mi (55 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SD036 over Grace Coolidge Ck built?

It was built in 1989, making it 36 years old in 2025.

What condition is SD036 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 December 2022.

How much traffic does SD036 over Grace Coolidge Ck carry?

About 955 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is SD036 over Grace Coolidge Ck?

The structure is 65 ft (19.8 m) long with a longest span of 21 ft (6.4 m).

Who owns SD036 over Grace Coolidge Ck?

It is owned by the State Highway Agency.