US Bridges

County HWY 12 over Sangamon River

Good

Sangamon County, Illinois · 3.5 MI NE Rochester · Structure no. 084302100000000

Built
1957
68 years old, rebuilt 1996
Condition
Good
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
770 ft
3 main spans
Daily traffic
1,300
2022 count
Owner
County
County Highway Agency

About this bridge

County HWY 12 over Sangamon River is a steel stringer/multi-beam or girder carrying County HWY 12 over Sangamon River in Sangamon County, Illinois. It was built in 1957 and reconstructed in 1996, so it is 68 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 1,300 vehicles a day, roughly 5% of them trucks, projected to reach 1,768 by 2046. The structure is 770 ft (234.7 m) long and 30 ft wide. If it were closed, the detour would be 11.2 mi (18 km).

Location

Open in Google Maps
CarriesCounty HWY 12
CrossesSangamon River
Location3.5 MI NE Rochester
RouteCounty Highway 0
CountySangamon County
StateIllinois
Coordinates39.80269, -89.49861
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.9 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3 (+7 approach)
Design loadHS 20
Structure length770 ft (234.7 m)
Longest span150 ft (45.7 m)
Deck width30 ft (9.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,300 (2022)
Projected traffic1,768 by 2046
Trucks5%
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 County HWY 12 over Sangamon River built?

It was built in 1957, making it 68 years old in 2025. It was reconstructed in 1996.

What condition is County HWY 12 over Sangamon River 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 April 2023.

How much traffic does County HWY 12 over Sangamon River carry?

About 1,300 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is County HWY 12 over Sangamon River?

The structure is 770 ft (234.7 m) long with a longest span of 150 ft (45.7 m) and a deck 30 ft wide.

Who owns County HWY 12 over Sangamon River?

It is owned by the County Highway Agency.