US Bridges

Grassy Road over Little Grassy Lk Spillwy

FairPosted for load

Williamson County, Illinois · 10.0 MI SW of Hdqrtrs · Structure no. 000033610-00400

Built
1939
86 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
124 ft
2 main spans
Daily traffic
800
2023 count
Owner
Federal
Bureau of Fish and Wildlife

About this bridge

Grassy Road over Little Grassy Lk Spillwy is a steel stringer/multi-beam or girder carrying Grassy Road over Little Grassy Lk Spillwy in Williamson County, Illinois. It was built in 1939, so it is 86 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 800 vehicles a day, roughly 1% of them trucks, projected to reach 900 by 2043. The structure is 124 ft (37.8 m) long and 33 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesGrassy Road
CrossesLittle Grassy Lk Spillwy
Location10.0 MI SW of Hdqrtrs
RouteFederal Lands Road 0
CountyWilliamson County
StateIllinois
Coordinates37.647, -89.13783
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation3: Basically intolerable, requiring high priority of corrective action
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating14 US tons
Inventory rating8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length124 ft (37.8 m)
Longest span60 ft (18.3 m)
Deck width33 ft (10 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic800 (2023)
Projected traffic900 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Fish and Wildlife
Maintained byBureau of Fish and Wildlife
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 Grassy Road over Little Grassy Lk Spillwy built?

It was built in 1939, making it 86 years old in 2025.

What condition is Grassy Road over Little Grassy Lk Spillwy 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 June 2023.

How much traffic does Grassy Road over Little Grassy Lk Spillwy carry?

About 800 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is Grassy Road over Little Grassy Lk Spillwy?

The structure is 124 ft (37.8 m) long with a longest span of 60 ft (18.3 m) and a deck 33 ft wide.

Who owns Grassy Road over Little Grassy Lk Spillwy?

It is owned by the Bureau of Fish and Wildlife.