US Bridges

SD028 over Lake Poinsett Outlet

Fair

Hamlin County, South Dakota · 5.0 E JCT US 81 · Structure no. 000000029227144

Built
1951
74 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete Continuous
Length
67 ft
3 main spans
Daily traffic
1,034
2024 count
Owner
State
State Highway Agency

About this bridge

SD028 over Lake Poinsett Outlet is a concrete continuous slab carrying SD028 over Lake Poinsett Outlet in Hamlin County, South Dakota. It was built in 1951, so it is 74 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 1,034 vehicles a day, roughly 27% of them trucks, projected to reach 1,556 by 2044. The structure is 67 ft (20.4 m) long and 34 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

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CarriesSD028
CrossesLake Poinsett Outlet
Location5.0 E JCT US 81
RouteState Highway 28
CountyHamlin County
StateSouth Dakota
Coordinates44.59581, -97.03259
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating57.4 US tons
Inventory rating34.4 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length67 ft (20.4 m)
Longest span24 ft (7.2 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,034 (2024)
Projected traffic1,556 by 2044
Trucks27%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed28 mi (45 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 SD028 over Lake Poinsett Outlet built?

It was built in 1951, making it 74 years old in 2025.

What condition is SD028 over Lake Poinsett 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 September 2023.

How much traffic does SD028 over Lake Poinsett Outlet carry?

About 1,034 vehicles per day (2024 count), of which roughly 27% are trucks.

How long is SD028 over Lake Poinsett Outlet?

The structure is 67 ft (20.4 m) long with a longest span of 24 ft (7.2 m) and a deck 34 ft wide.

Who owns SD028 over Lake Poinsett Outlet?

It is owned by the State Highway Agency.