US Bridges

126th Street over Richmond Lake

Fair

Brown County, South Dakota · 4.5N & 0.8E of Richmond · Structure no. 000000007055260

Built
2001
24 years old
Condition
Fair
inspected August 2023
Type
Tee Beam
Prestressed Concrete
Length
51 ft
1 main span
Daily traffic
199
2022 count
Owner
County
County Highway Agency

About this bridge

126th Street over Richmond Lake is a prestressed concrete tee beam carrying 126th Street over Richmond Lake in Brown County, South Dakota. It was built in 2001, so it is 24 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 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 199 vehicles a day, roughly 3% of them trucks, projected to reach 199 by 2032. The structure is 51 ft (15.5 m) long and 35 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Carries126th Street
CrossesRichmond Lake
Location4.5N & 0.8E of Richmond
RouteCounty Highway 6525
Coordinates45.56167, -98.60974
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length51 ft (15.5 m)
Longest span49 ft (14.9 m)
Deck width35 ft (10.6 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic199 (2022)
Projected traffic199 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 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 126th Street over Richmond Lake built?

It was built in 2001, making it 24 years old in 2025.

What condition is 126th Street over Richmond Lake 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 August 2023.

How much traffic does 126th Street over Richmond Lake carry?

About 199 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 126th Street over Richmond Lake?

The structure is 51 ft (15.5 m) long with a longest span of 49 ft (14.9 m) and a deck 35 ft wide.

Who owns 126th Street over Richmond Lake?

It is owned by the County Highway Agency.