US Bridges

Shelbyville Dam over Lake Shelbyville

FairPosted for load

Shelby County, Illinois · Shelbyville Il · Structure no. CEPLMSIL-000002

Built
1970
55 years old
Condition
Fair
inspected May 2022
Type
Stringer/Multi-beam or Girder
Steel
Length
166 ft
3 main spans
Daily traffic
900
2018 count
Owner
Federal
Corps of Engineers (Civil)

About this bridge

Shelbyville Dam over Lake Shelbyville is a steel stringer/multi-beam or girder carrying Shelbyville Dam over Lake Shelbyville in Shelby County, Illinois. It was built in 1970, so it is 55 years old, older than the Illinois average of 45.3 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. Its operating status is: posted for load restriction.

It carries about 900 vehicles a day, roughly 10% of them trucks, projected to reach 2,025 by 2039. The structure is 166 ft (50.5 m) long and 32 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesShelbyville Dam
CrossesLake Shelbyville
LocationShelbyville Il
CountyShelby County
StateIllinois
Coordinates39.40907, -88.7804
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2022
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating32.5 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length166 ft (50.5 m)
Longest span50 ft (15.3 m)
Deck width32 ft (9.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic900 (2018)
Projected traffic2,025 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCorps of Engineers (Civil)
Maintained byCorps of Engineers (Civil)
Historic statusHistorical significance not determinable at this time
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$1.5 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Shelbyville Dam over Lake Shelbyville built?

It was built in 1970, making it 55 years old in 2025.

What condition is Shelbyville Dam over Lake Shelbyville 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 May 2022.

How much traffic does Shelbyville Dam over Lake Shelbyville carry?

About 900 vehicles per day (2018 count), of which roughly 10% are trucks.

How long is Shelbyville Dam over Lake Shelbyville?

The structure is 166 ft (50.5 m) long with a longest span of 50 ft (15.3 m) and a deck 32 ft wide.

Who owns Shelbyville Dam over Lake Shelbyville?

It is owned by the Corps of Engineers (Civil).