US Bridges

Cth Nn over Mormon Creek

Poor

La Crosse County, Wisconsin · 0.2M S JCT Cth M · Structure no. P32007700000000

Built
1977
48 years old
Condition
Poor
inspected April 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
77 ft
1 main span
Daily traffic
81
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Nn over Mormon Creek is a prestressed concrete stringer/multi-beam or girder carrying Cth Nn over Mormon Creek in La Crosse County, Wisconsin. It was built in 1977, so it is 48 years old, older than the Wisconsin average of 40.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 81 vehicles a day, projected to reach 89 by 2042. The structure is 77 ft (23.5 m) long and 30 ft wide. If it were closed, the detour would be 12.4 mi (20 km).

Location

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CarriesCth Nn
CrossesMormon Creek
Location0.2M S JCT Cth M
RouteCounty Highway 0NN
CountyLa Crosse County
StateWisconsin
Coordinates43.75295, -91.07012
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2023
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 rating55.8 US tons
Inventory rating30.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length77 ft (23.5 m)
Longest span75 ft (22.9 m)
Deck width30 ft (9.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic81 (2022)
Projected traffic89 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed12.4 mi (20 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$322,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Nn over Mormon Creek built?

It was built in 1977, making it 48 years old in 2025.

What condition is Cth Nn over Mormon Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in April 2023.

How much traffic does Cth Nn over Mormon Creek carry?

About 81 vehicles per day (2022 count).

How long is Cth Nn over Mormon Creek?

The structure is 77 ft (23.5 m) long with a longest span of 75 ft (22.9 m) and a deck 30 ft wide.

Who owns Cth Nn over Mormon Creek?

It is owned by the County Highway Agency.