US Bridges

Thayer Road over Br of Nippersink CR

Fair

McHenry County, Illinois · 1.8 MI E of Il 47 · Structure no. 056306000000000

Built
1954
71 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
32 ft
1 main span
Daily traffic
750
2021 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

Thayer Road over Br of Nippersink CR is a concrete slab carrying Thayer Road over Br of Nippersink CR in McHenry County, Illinois. It was built in 1954, so it is 71 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 750 vehicles a day, roughly 7% of them trucks, projected to reach 900 by 2046. The structure is 32 ft (9.8 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesThayer Road
CrossesBr of Nippersink CR
Location1.8 MI E of Il 47
RouteCounty Highway 0
CountyMcHenry County
StateIllinois
Coordinates42.41441, -88.40257
Functional classUrban Local

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating50.4 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length32 ft (9.8 m)
Longest span31 ft (9.4 m)
Deck width24 ft (7.4 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic750 (2021)
Projected traffic900 by 2046
Trucks7%
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 Thayer Road over Br of Nippersink CR built?

It was built in 1954, making it 71 years old in 2025.

What condition is Thayer Road over Br of 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 October 2024.

How much traffic does Thayer Road over Br of Nippersink CR carry?

About 750 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is Thayer Road over Br of Nippersink CR?

The structure is 32 ft (9.8 m) long with a longest span of 31 ft (9.4 m) and a deck 24 ft wide.

Who owns Thayer Road over Br of Nippersink CR?

It is owned by the Town or Township Highway Agency.