US Bridges

254th ST HWY 122 over Willow Ck

Good

Minnehaha County, South Dakota · 1.4S & 1.1E Lyons · Structure no. 000000050141100

Built
1998
27 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete Continuous
Length
25 ft
2 main spans
Daily traffic
819
2022 count
Owner
County
County Highway Agency

About this bridge

254th ST HWY 122 over Willow Ck is a concrete continuous culvert carrying 254th ST HWY 122 over Willow Ck in Minnehaha County, South Dakota. It was built in 1998, so it is 27 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 819 vehicles a day, roughly 2% of them trucks, projected to reach 942 by 2037. The structure is 25 ft (7.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Carries254th ST HWY 122
CrossesWillow Ck
Location1.4S & 1.1E Lyons
RouteCounty Highway 0
Coordinates43.70305, -96.8509
Functional classRural Major Collector

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 protection8 Very GoodNo problems noted.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating102.2 US tons
Inventory rating61.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.5 m)
Longest span13 ft (3.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic819 (2022)
Projected traffic942 by 2037
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$228,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 254th ST HWY 122 over Willow Ck built?

It was built in 1998, making it 27 years old in 2025.

What condition is 254th ST HWY 122 over Willow 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 July 2023.

How much traffic does 254th ST HWY 122 over Willow Ck carry?

About 819 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 254th ST HWY 122 over Willow Ck?

The structure is 25 ft (7.5 m) long with a longest span of 13 ft (3.9 m).

Who owns 254th ST HWY 122 over Willow Ck?

It is owned by the County Highway Agency.