Bridge conditions in Portage County, Wisconsin
183 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
4 of the 183 bridges the federal inventory lists in Portage County are rated poor; the rest split 90 good and 89 fair.
- 4 of the 183 bridges in Portage County, Wisconsin, are rated in poor condition (2.2%) in the 2025 National Bridge Inventory, as of .
- 90 bridges (49.2%) are rated good and 89 (48.6%) fair.
- The median Portage County bridge was built in 2000.
- The busiest poor-rated bridge is Cth O over Mill Creek (built 1975), carrying about 1,250 vehicles a day.
Good 49.2% · Fair 48.6% · Poor 2.2% of 183 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 O over Mill Creek | 1975 | 1,250 | Poor |
| Cth Ww over Four Mile Creek | 2007 | 565 | Poor |
| Cth II over Bear Creek | 1975 | 108 | Poor |
| Lrd Washington St over Tomorrow River | 1938 | 101 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Ih Ush 51-ih 39 over Hay Meadow Creek | 1972 | 29,800 | Good |
| Ush 10 over Ih Ush 51-ih 39 | 1968 | 25,755 | Fair |
| Ih Ush51-ih39nb over Cth B | 1969 | 24,620 | Fair |
| Ih Ush51-ih39sb over Cth B | 1969 | 24,620 | Fair |
| Sth 66-main St. over Plover River | 1926 | 19,200 | Fair |
| Ih Ush51-ih39nb over Sth 66 | 1968 | 16,900 | Fair |
| Ih Ush51-ih39sb over Sth 66 | 1968 | 16,900 | Fair |
| Ih Ush51-ih39nb over Plover River | 1969 | 16,850 | Fair |
| Ih Ush51-ih39sb over Plover River | 1969 | 16,850 | Fair |
| Ih USH51 - IH39 NB over Duck Creek | 1962 | 14,600 | 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.