US Bridges

Dunham ROAD/CHA-29 over N Br Kishwaukee Riv

Good

McHenry County, Illinois · 1.2 MI W of US 14 · Structure no. 056317900000000

Built
2011
14 years old
Condition
Good
inspected October 2021
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
92 ft
1 main span
Daily traffic
250
2021 count
Owner
County
County Highway Agency

About this bridge

Dunham ROAD/CHA-29 over N Br Kishwaukee Riv is a prestressed concrete stringer/multi-beam or girder carrying Dunham ROAD/CHA-29 over N Br Kishwaukee Riv in McHenry County, Illinois. It was built in 2011, so it is 14 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 250 vehicles a day, roughly 8% of them trucks, projected to reach 300 by 2046. The structure is 92 ft (28 m) long and 43 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesDunham ROAD/CHA-29
CrossesN Br Kishwaukee Riv
Location1.2 MI W of US 14
RouteCounty Highway 0
CountyMcHenry County
StateIllinois
Coordinates42.35666, -88.58034
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating58.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length92 ft (28 m)
Longest span89 ft (27.2 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic250 (2021)
Projected traffic300 by 2046
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Dunham ROAD/CHA-29 over N Br Kishwaukee Riv built?

It was built in 2011, making it 14 years old in 2025.

What condition is Dunham ROAD/CHA-29 over N Br Kishwaukee Riv 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 2021.

How much traffic does Dunham ROAD/CHA-29 over N Br Kishwaukee Riv carry?

About 250 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is Dunham ROAD/CHA-29 over N Br Kishwaukee Riv?

The structure is 92 ft (28 m) long with a longest span of 89 ft (27.2 m) and a deck 43 ft wide.

Who owns Dunham ROAD/CHA-29 over N Br Kishwaukee Riv?

It is owned by the County Highway Agency.