US Bridges

Cth Pq / Water ST over Koshkonong Creek

Poor

Dane County, Wisconsin · 0.1M W JCT Ush 12 · Structure no. B13007200000000

Built
1957
68 years old
Condition
Poor
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
1,480
2022 count
Owner
County
County Highway Agency

About this bridge

Cth Pq / Water ST over Koshkonong Creek is a steel stringer/multi-beam or girder carrying Cth Pq / Water ST over Koshkonong Creek in Dane County, Wisconsin. It was built in 1957, so it is 68 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 1,480 vehicles a day, projected to reach 1,628 by 2043. The structure is 53 ft (16.2 m) long and 39 ft wide. If it were closed, the detour would be 5.6 mi (9 km).

Location

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CarriesCth Pq / Water ST
CrossesKoshkonong Creek
Location0.1M W JCT Ush 12
RouteCounty Highway 0PQ
CountyDane County
StateWisconsin
Coordinates43.00289, -89.01981
Functional classRural Minor Collector

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionNovember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating26.5 US tons
Inventory rating16.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length53 ft (16.2 m)
Longest span52 ft (15.7 m)
Deck width39 ft (11.8 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,480 (2022)
Projected traffic1,628 by 2043
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$330,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Cth Pq / Water ST over Koshkonong Creek built?

It was built in 1957, making it 68 years old in 2025.

What condition is Cth Pq / Water ST over Koshkonong 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 November 2024.

How much traffic does Cth Pq / Water ST over Koshkonong Creek carry?

About 1,480 vehicles per day (2022 count).

How long is Cth Pq / Water ST over Koshkonong Creek?

The structure is 53 ft (16.2 m) long with a longest span of 52 ft (15.7 m) and a deck 39 ft wide.

Who owns Cth Pq / Water ST over Koshkonong Creek?

It is owned by the County Highway Agency.