US Bridges

Cth I over Blue River

Fair

Grant County, Wisconsin · 2.4M N JCT Ush 18 · Structure no. B22012100000000

Built
1991
34 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
68 ft
2 main spans
Daily traffic
784
2022 count
Owner
County
County Highway Agency

About this bridge

Cth I over Blue River is a concrete continuous slab carrying Cth I over Blue River in Grant County, Wisconsin. It was built in 1991, so it is 34 years old, younger than the Wisconsin average of 40.3 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 784 vehicles a day, projected to reach 862 by 2043. The structure is 68 ft (20.7 m) long and 38 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

Open in Google Maps
CarriesCth I
CrossesBlue River
Location2.4M N JCT Ush 18
RouteCounty Highway 0I
CountyGrant County
StateWisconsin
Coordinates43.00081, -90.4285
Functional classRural Minor 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating70.2 US tons
Inventory rating41.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length68 ft (20.7 m)
Longest span33 ft (10.1 m)
Deck width38 ft (11.6 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic784 (2022)
Projected traffic862 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5.6 mi (9 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 Cth I over Blue River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Cth I over Blue River 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 2024.

How much traffic does Cth I over Blue River carry?

About 784 vehicles per day (2022 count).

How long is Cth I over Blue River?

The structure is 68 ft (20.7 m) long with a longest span of 33 ft (10.1 m) and a deck 38 ft wide.

Who owns Cth I over Blue River?

It is owned by the County Highway Agency.