US Bridges

Big Mound Rd. over Br. Stillman Cr.

Good

Ogle County, Illinois · 2.5 S.E. Stillman Va · Structure no. 071502000000000

Built
1960
65 years old
Condition
Good
inspected July 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
300
2022 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Big Mound Rd. over Br. Stillman Cr. is a concrete culvert carrying Big Mound Rd. over Br. Stillman Cr. in Ogle County, Illinois. It was built in 1960, so it is 65 years old, older than the Illinois average of 45.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, roughly 6% of them trucks, projected to reach 286 by 2046. The structure is 26 ft (7.8 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesBig Mound Rd.
CrossesBr. Stillman Cr.
Location2.5 S.E. Stillman Va
RouteCounty Highway 0
CountyOgle County
StateIllinois
Coordinates42.07795, -89.14381
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating23.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 15
Structure length26 ft (7.8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2022)
Projected traffic286 by 2046
Trucks6%
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

OwnerTown or Township Highway Agency
Maintained byTown or Township Highway Agency
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 Big Mound Rd. over Br. Stillman Cr. built?

It was built in 1960, making it 65 years old in 2025.

What condition is Big Mound Rd. over Br. Stillman Cr. in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Big Mound Rd. over Br. Stillman Cr. carry?

About 300 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Big Mound Rd. over Br. Stillman Cr.?

The structure is 26 ft (7.8 m) long with a longest span of 12 ft (3.7 m).

Who owns Big Mound Rd. over Br. Stillman Cr.?

It is owned by the Town or Township Highway Agency.