Cth C over Mill Creek
Portage County, Wisconsin · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Cth C over Mill Creek in Portage County, Wisconsin, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1971, making it 54 years old at the 2025 inventory.
- It carries about 900 vehicles a day (traffic count year 2023).
- Its listed owner is the county highway agency.
- It is one of 89 of the 183 inventoried bridges in Portage County rated fair (48.6%); 4 (2.2%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated August 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (44.51881, -89.66641)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 5 | 5 | Fair condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 108 ft |
| Location | 2.5M E Jct Cth II |
| NBI structure number | B49006000000000 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 8: foundations stable, scour above the top of the footing |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wisconsin department of transportation.
Busiest bridges in Portage 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 |
All bridges nearby: Portage County, WI bridge conditions · every bridge in Portage County · Wisconsin bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.