US Bridges

29850 Frogcreek RD over Frog Ck

Fair

Clay County, South Dakota · 1.5S & 7E Irene · Structure no. 000000014070015

Built
1965
60 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
80 ft
3 main spans
Daily traffic
95
2022 count
Owner
County
County Highway Agency

About this bridge

29850 Frogcreek RD over Frog Ck is a concrete continuous slab carrying 29850 Frogcreek RD over Frog Ck in Clay County, South Dakota. It was built in 1965, so it is 60 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 95 vehicles a day, roughly 3% of them trucks, projected to reach 95 by 2032. The structure is 80 ft (24.4 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Carries29850 Frogcreek RD
CrossesFrog Ck
Location1.5S & 7E Irene
RouteCounty Highway 0
Coordinates43.06145, -97.02389
Functional classRural Minor 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.
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 inspectionAugust 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 alignment8: Equal to present desirable criteria
Operating rating58.8 US tons
Inventory rating35.2 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length80 ft (24.4 m)
Longest span30 ft (9.1 m)
Deck width34 ft (10.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95 (2022)
Projected traffic95 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$25,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 29850 Frogcreek RD over Frog Ck built?

It was built in 1965, making it 60 years old in 2025.

What condition is 29850 Frogcreek RD over Frog Ck 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 2024.

How much traffic does 29850 Frogcreek RD over Frog Ck carry?

About 95 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is 29850 Frogcreek RD over Frog Ck?

The structure is 80 ft (24.4 m) long with a longest span of 30 ft (9.1 m) and a deck 34 ft wide.

Who owns 29850 Frogcreek RD over Frog Ck?

It is owned by the County Highway Agency.