US Bridges

Kishwaukee RD over Stillman Creek

Fair

Ogle County, Illinois · 1.5 MI E Byron · Structure no. 071321100000000

Built
1965
60 years old
Condition
Fair
inspected July 2023
Type
Slab
Concrete Continuous
Length
85 ft
3 main spans
Daily traffic
3,000
2022 count
Owner
County
County Highway Agency

About this bridge

Kishwaukee RD over Stillman Creek is a concrete continuous slab carrying Kishwaukee RD over Stillman Creek in Ogle County, Illinois. It was built in 1965, so it is 60 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.

It carries about 3,000 vehicles a day, roughly 6% of them trucks, projected to reach 2,964 by 2046. The structure is 85 ft (25.8 m) long and 32 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesKishwaukee RD
CrossesStillman Creek
Location1.5 MI E Byron
RouteCounty Highway 0
CountyOgle County
StateIllinois
Coordinates42.12087, -89.2263
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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
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
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.8 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length85 ft (25.8 m)
Longest span32 ft (9.8 m)
Deck width32 ft (9.8 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2022)
Projected traffic2,964 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.2 mi (18 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Kishwaukee RD over Stillman Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is Kishwaukee RD over Stillman Creek 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 Kishwaukee RD over Stillman Creek carry?

About 3,000 vehicles per day (2022 count), of which roughly 6% are trucks.

How long is Kishwaukee RD over Stillman Creek?

The structure is 85 ft (25.8 m) long with a longest span of 32 ft (9.8 m) and a deck 32 ft wide.

Who owns Kishwaukee RD over Stillman Creek?

It is owned by the County Highway Agency.