US Bridges

E Main ST FAS 6488 over Beaver Ck

PoorPosted for load

Custer County, South Dakota · 0.4E Buffalo Gap · Structure no. 000000017379260

Built
1971
54 years old
Condition
Poor
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
37 ft
1 main span
Daily traffic
108
2022 count
Owner
County
County Highway Agency

About this bridge

E Main ST FAS 6488 over Beaver Ck is a prestressed concrete tee beam carrying E Main ST FAS 6488 over Beaver Ck in Custer County, South Dakota. It was built in 1971, so it is 54 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 poor condition with a lowest component rating of 3 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 108 vehicles a day, roughly 3% of them trucks, projected to reach 108 by 2032. The structure is 37 ft (11.3 m) long and 27 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesE Main ST FAS 6488
CrossesBeaver Ck
Location0.4E Buffalo Gap
RouteCounty Highway 0
Coordinates43.49186, -103.30483
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure3 SeriousLoss of section, deterioration, spalling or scour have seriously affected primary structural components.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourUnknown foundation; not evaluated for scour
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating18 US tons
Inventory rating10.5 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadUnknown
Structure length37 ft (11.3 m)
Longest span35 ft (10.7 m)
Deck width27 ft (8.2 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic108 (2022)
Projected traffic108 by 2032
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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$14,000
NavigationNo navigation control on waterway

Frequently asked questions

When was E Main ST FAS 6488 over Beaver Ck built?

It was built in 1971, making it 54 years old in 2025.

What condition is E Main ST FAS 6488 over Beaver Ck in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does E Main ST FAS 6488 over Beaver Ck carry?

About 108 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is E Main ST FAS 6488 over Beaver Ck?

The structure is 37 ft (11.3 m) long with a longest span of 35 ft (10.7 m) and a deck 27 ft wide.

Who owns E Main ST FAS 6488 over Beaver Ck?

It is owned by the County Highway Agency.