US Bridges

SD045 over Br Smith Ck

Fair

Brule County, South Dakota · 7 S Buffalo CO Line · Structure no. 000000008250069

Built
1957
68 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
80 ft
3 main spans
Daily traffic
949
2024 count
Owner
State
State Highway Agency

About this bridge

SD045 over Br Smith Ck is a concrete continuous slab carrying SD045 over Br Smith Ck in Brule County, South Dakota. It was built in 1957, so it is 68 years old, older 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 949 vehicles a day, roughly 21% of them trucks, projected to reach 1,231 by 2044. The structure is 80 ft (24.4 m) long and 34 ft wide. If it were closed, the detour would be 42.3 mi (68 km).

CarriesSD045
CrossesBr Smith Ck
Location7 S Buffalo CO Line
RouteState Highway 45
Coordinates43.83489, -98.97328
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.7 US tons
Inventory rating36.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length80 ft (24.4 m)
Longest span28 ft (8.6 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic949 (2024)
Projected traffic1,231 by 2044
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed42.3 mi (68 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 SD045 over Br Smith Ck built?

It was built in 1957, making it 68 years old in 2025.

What condition is SD045 over Br Smith 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 July 2024.

How much traffic does SD045 over Br Smith Ck carry?

About 949 vehicles per day (2024 count), of which roughly 21% are trucks.

How long is SD045 over Br Smith Ck?

The structure is 80 ft (24.4 m) long with a longest span of 28 ft (8.6 m) and a deck 34 ft wide.

Who owns SD045 over Br Smith Ck?

It is owned by the State Highway Agency.