US Bridges

Nelson Road over Slough Creek

Fair

McHenry County, Illinois · 0.05 MI E Murray RD · Structure no. 056320100000000

Built
1963
62 years old
Condition
Fair
inspected September 2024
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
1,800
2021 count
Owner
County
County Highway Agency

About this bridge

Nelson Road over Slough Creek is a concrete culvert carrying Nelson Road over Slough Creek in McHenry County, Illinois. It was built in 1963, so it is 62 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 1,800 vehicles a day, roughly 9% of them trucks, projected to reach 2,160 by 2046. The structure is 26 ft (7.9 m) long and 76 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesNelson Road
CrossesSlough Creek
Location0.05 MI E Murray RD
RouteCounty Highway 0
CountyMcHenry County
StateIllinois
Coordinates42.36346, -88.50082
Functional classRural Minor 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
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 rating97.9 US tons
Inventory rating69.7 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckOther
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.7 m)
Deck width76 ft (23.1 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,800 (2021)
Projected traffic2,160 by 2046
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Nelson Road over Slough Creek built?

It was built in 1963, making it 62 years old in 2025.

What condition is Nelson Road over Slough 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 September 2024.

How much traffic does Nelson Road over Slough Creek carry?

About 1,800 vehicles per day (2021 count), of which roughly 9% are trucks.

How long is Nelson Road over Slough Creek?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.7 m) and a deck 76 ft wide.

Who owns Nelson Road over Slough Creek?

It is owned by the County Highway Agency.