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Bridge conditions in Door County, Wisconsin

33 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory

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

The federal inventory lists 33 bridges in Door County: 15 rated good, 17 fair, and 1 poor.

1 of the 33 bridges in Door County, Wisconsin, are rated in poor condition (3.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
15 bridges (45.5%) are rated good and 17 (51.5%) fair.
The median Door County bridge was built in 1987.
The busiest poor-rated bridge is Cth N over Green Bay Tributary (built 1965), carrying about 235 vehicles a day.

Good 45.5% · Fair 51.5% · Poor 3.0% of 33 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Cth N over Green Bay Tributary	1965	235	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Sth 42 - Sth 57 over Sturgeon Bay	1978	14,200	Fair
Sth 42 - Sth 57 over Sturgeon Bay	1978	12,500	Fair
Sth 42 - Sth 57 over Sturgeon Bay	1978	12,500	Fair
Sth 42 - Sth 57 over Sturgeon Bay	1978	12,500	Fair
Sth 42 - Sth 57 over Lrd Memorial Dr	1978	12,500	Fair
Sth 57 NB over Fabry CR	2008	11,200	Fair
Lrd Michigan Stree over Sturgeon Bay	1930	8,300	Good
Lrd Michigan Stree over Sturgeon Bay	1930	8,300	Fair
Lrd Michigan Stree over Sturgeon Bay	1930	8,300	Fair
Sth 42 Sb-sth 57 S over Lrd Green Bay Rd	1977	7,750	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

All of Wisconsin: Wisconsin bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.