Home › Wisconsin › Dane County › Cth A over Koshkonong Creek

Cth A over Koshkonong Creek

Dane County, Wisconsin · rated Poor in the 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Cth A over Koshkonong Creek in Dane County, Wisconsin, is rated in poor condition in the 2025 National Bridge Inventory (as of August 20, 2026).
Its lowest-rated component is the superstructure, rated 4 (poor condition) on the 0-9 scale.
It was built in 1956, making it 69 years old at the 2025 inventory.
It carries about 490 vehicles a day (traffic count year 2022).
Its listed owner is the county highway agency.
It is one of 42 of the 593 inventoried bridges in Dane County rated poor (7.1%); 42 (7.1%) are rated poor.
A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.

Component ratings


Structure	Steel stringer or multi-beam girder
Length	about 62 ft
Location	2.3M E Jct Sth 73
NBI structure number	B13005600000000
Condition class	Poor

Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.

Bridge	Built	Vehicles/day	Condition
Ush 12/18-w Beltli over Cmstpp RR	1975	131,000	Good
Ush 12/14/18/151 over Lrd Todd Dr	1971	129,000	Fair
Ush 12/18-s Beltli over Drainage Ditch	1988	117,000	Fair
Ih 39/90/94 over Starkweather Creek	1959	109,000	Fair
Ush 12/18 over Br Yahara River	1962	86,700	Fair
Ush 12/18 over Drainage Ditch	1987	86,700	Fair