US Bridges

455th Avenue over Big Sioux River

Fair

Roberts County, South Dakota · 1.7S of JCT With US 12 · Structure no. 000000055060438

Built
1939
86 years old
Condition
Fair
inspected July 2024
Type
Slab
Concrete Continuous
Length
36 ft
2 main spans
Daily traffic
2,500
2022 count
Owner
County
County Highway Agency

About this bridge

455th Avenue over Big Sioux River is a concrete continuous slab carrying 455th Avenue over Big Sioux River in Roberts County, South Dakota. It was built in 1939, so it is 86 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 5 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 2,500 vehicles a day, roughly 3% of them trucks, projected to reach 2,500 by 2032. The structure is 36 ft (11 m) long and 33 ft wide. If it were closed, the detour would be 36 mi (58 km).

Location

Open in Google Maps
Carries455th Avenue
CrossesBig Sioux River
Location1.7S of JCT With US 12
RouteCounty Highway 0
CountyRoberts County
StateSouth Dakota
Coordinates45.30015, -97.1031
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length36 ft (11 m)
Longest span17 ft (5.2 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,500 (2022)
Projected traffic2,500 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 455th Avenue over Big Sioux River built?

It was built in 1939, making it 86 years old in 2025.

What condition is 455th Avenue over Big Sioux River 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 455th Avenue over Big Sioux River carry?

About 2,500 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 455th Avenue over Big Sioux River?

The structure is 36 ft (11 m) long with a longest span of 17 ft (5.2 m) and a deck 33 ft wide.

Who owns 455th Avenue over Big Sioux River?

It is owned by the County Highway Agency.