US Bridges

SD028 over Lake Poinsett Inlet

Fair

Hamlin County, South Dakota · 3.3 E JCT US 81 · Structure no. 000000029213140

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

About this bridge

SD028 over Lake Poinsett Inlet is a concrete continuous slab carrying SD028 over Lake Poinsett Inlet 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 93 ft (28.3 m) long and 43 ft wide. If it were closed, the detour would be 28 mi (45 km).

Location

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CarriesSD028
CrossesLake Poinsett Inlet
Location3.3 E JCT US 81
RouteState Highway 28
CountyHamlin County
StateSouth Dakota
Coordinates44.60194, -97.06269
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating64.9 US tons
Inventory rating38.9 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length93 ft (28.3 m)
Longest span33 ft (10.2 m)
Deck width43 ft (13.2 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 and pedestrian
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 Inlet built?

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

What condition is SD028 over Lake Poinsett Inlet 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 Inlet carry?

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

How long is SD028 over Lake Poinsett Inlet?

The structure is 93 ft (28.3 m) long with a longest span of 33 ft (10.2 m) and a deck 43 ft wide.

Who owns SD028 over Lake Poinsett Inlet?

It is owned by the State Highway Agency.