US Bridges

FAS 6155 over Okobojo Ck

Fair

Sully County, South Dakota · 6.6E & 2.2N Agar · Structure no. 000000060380018

Built
1936
89 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
53 ft
3 main spans
Daily traffic
47
2022 count
Owner
County
County Highway Agency

About this bridge

FAS 6155 over Okobojo Ck is a concrete continuous slab carrying FAS 6155 over Okobojo Ck in Sully County, South Dakota. It was built in 1936, so it is 89 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 6 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 47 vehicles a day, roughly 3% of them trucks, projected to reach 47 by 2032. The structure is 53 ft (16.2 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesFAS 6155
CrossesOkobojo Ck
Location6.6E & 2.2N Agar
RouteCounty Highway 0
Coordinates44.87058, -99.93954
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to 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 typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length53 ft (16.2 m)
Longest span17 ft (5.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic47 (2022)
Projected traffic47 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$6,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FAS 6155 over Okobojo Ck built?

It was built in 1936, making it 89 years old in 2025.

What condition is FAS 6155 over Okobojo 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 July 2023.

How much traffic does FAS 6155 over Okobojo Ck carry?

About 47 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is FAS 6155 over Okobojo Ck?

The structure is 53 ft (16.2 m) long with a longest span of 17 ft (5.2 m) and a deck 27 ft wide.

Who owns FAS 6155 over Okobojo Ck?

It is owned by the County Highway Agency.