US Bridges

E. Rock Grove RD over South Otter Creek

Good

Stephenson County, Illinois · 0.3 MI W Davis RD · Structure no. 089510800000000

Built
1994
31 years old
Condition
Good
inspected October 2024
Type
Culvert
Concrete
Length
33 ft
3 main spans
Daily traffic
775
2024 count
Owner
County
County Highway Agency

About this bridge

E. Rock Grove RD over South Otter Creek is a concrete culvert carrying E. Rock Grove RD over South Otter Creek in Stephenson County, Illinois. It was built in 1994, so it is 31 years old, younger 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 775 vehicles a day, roughly 6% of them trucks, projected to reach 859 by 2046. The structure is 33 ft (10 m) long. If it were closed, the detour would be 6.8 mi (11 km).

CarriesE. Rock Grove RD
CrossesSouth Otter Creek
Location0.3 MI W Davis RD
RouteCounty Highway 0
Coordinates42.46141, -89.42492
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
Channel and channel protection8 Very GoodNo problems noted.
Culvert8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length33 ft (10 m)
Longest span10 ft (3.1 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic775 (2024)
Projected traffic859 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 E. Rock Grove RD over South Otter Creek built?

It was built in 1994, making it 31 years old in 2025.

What condition is E. Rock Grove RD over South Otter Creek 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 October 2024.

How much traffic does E. Rock Grove RD over South Otter Creek carry?

About 775 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is E. Rock Grove RD over South Otter Creek?

The structure is 33 ft (10 m) long with a longest span of 10 ft (3.1 m).

Who owns E. Rock Grove RD over South Otter Creek?

It is owned by the County Highway Agency.