Patterson Lake RD over Portage River
Good Condition35 years old2,017 vehicles/day
Location
| State | Michigan |
| County | Livingston |
| Location | Sec 33 Putnam Twp |
| Carries | Patterson Lake RD |
| Crosses | Portage River |
| Coordinates | 42.43648, -83.96750 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 59.7 ft (18.2 m) |
| Max Span | 55.8 ft (17 m) |
| Deck Width | 44.6 ft (13.6 m) |
| Deck Area | 247.5 sq m |
| Main Spans | 1 |
| Year Built | 1991 |
Traffic
| Avg Daily Traffic | 2,017 (2013) |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 000000000005807 |