US Bridges

US 12 over N Br Nippersink CR

Fair

McHenry County, Illinois · Richmond · Structure no. 056001700000000

Built
1951
74 years old, rebuilt 1981
Condition
Fair
inspected August 2023
Type
Tee Beam
Concrete
Length
67 ft
1 main span
Daily traffic
11,600
2023 count
Owner
State
State Highway Agency

About this bridge

US 12 over N Br Nippersink CR is a concrete tee beam carrying US 12 over N Br Nippersink CR in McHenry County, Illinois. It was built in 1951 and reconstructed in 1981, so it is 74 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 5 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 11,600 vehicles a day, roughly 6% of them trucks, projected to reach 14,040 by 2046. The structure is 67 ft (20.4 m) long and 60 ft wide. If it were closed, the detour would be 26.1 mi (42 km).

Location

Open in Google Maps
CarriesUS 12
CrossesN Br Nippersink CR
LocationRichmond
RouteU.S. Route 12
CountyMcHenry County
StateIllinois
Coordinates42.47718, -88.30609
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating45 US tons
Inventory rating27.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length67 ft (20.4 m)
Longest span65 ft (19.8 m)
Deck width60 ft (18.4 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,600 (2023)
Projected traffic14,040 by 2046
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed26.1 mi (42 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$467,000
NavigationNo navigation control on waterway

Frequently asked questions

When was US 12 over N Br Nippersink CR built?

It was built in 1951, making it 74 years old in 2025. It was reconstructed in 1981.

What condition is US 12 over N Br Nippersink CR 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 August 2023.

How much traffic does US 12 over N Br Nippersink CR carry?

About 11,600 vehicles per day (2023 count), of which roughly 6% are trucks.

How long is US 12 over N Br Nippersink CR?

The structure is 67 ft (20.4 m) long with a longest span of 65 ft (19.8 m) and a deck 60 ft wide.

Who owns US 12 over N Br Nippersink CR?

It is owned by the State Highway Agency.