US Bridges

450th Avenue over Lake St. John Outlet

Fair

Hamlin County, South Dakota · 2.6S of Lake Norden · Structure no. 000000029140176

Built
1930
95 years old, rebuilt 1979
Condition
Fair
inspected July 2024
Type
Culvert
Concrete Continuous
Length
30 ft
2 main spans
Daily traffic
324
2022 count
Owner
County
County Highway Agency

About this bridge

450th Avenue over Lake St. John Outlet is a concrete continuous culvert carrying 450th Avenue over Lake St. John Outlet in Hamlin County, South Dakota. It was built in 1930 and reconstructed in 1979, so it is 95 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 324 vehicles a day, roughly 2% of them trucks, projected to reach 324 by 2032. The structure is 30 ft (9.1 m) long and 33 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
Carries450th Avenue
CrossesLake St. John Outlet
Location2.6S of Lake Norden
RouteCounty Highway 0
CountyHamlin County
StateSouth Dakota
Coordinates44.54916, -97.20914
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
Channel and channel protection7 GoodSome minor problems.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadH 15
Structure length30 ft (9.1 m)
Longest span10 ft (3.2 m)
Deck width33 ft (10.1 m)
Roadway width32 ft (9.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic324 (2022)
Projected traffic324 by 2032
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 450th Avenue over Lake St. John Outlet built?

It was built in 1930, making it 95 years old in 2025. It was reconstructed in 1979.

What condition is 450th Avenue over Lake St. John Outlet 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 450th Avenue over Lake St. John Outlet carry?

About 324 vehicles per day (2022 count), of which roughly 2% are trucks.

How long is 450th Avenue over Lake St. John Outlet?

The structure is 30 ft (9.1 m) long with a longest span of 10 ft (3.2 m) and a deck 33 ft wide.

Who owns 450th Avenue over Lake St. John Outlet?

It is owned by the County Highway Agency.