Il 31 over Crystal Creek
Good Condition13 years old17,900 vehicles/day
Location
| State | Illinois |
| County | McHenry |
| Location | 0.1 M S Algonquin RD |
| Carries | Il 31 |
| Crosses | Crystal Creek |
| Coordinates | 42.16864, -88.29685 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 8 (Very Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Steel |
| Design | Stringer/Multi-beam |
| Total Length | 139.4 ft (42.5 m) |
| Max Span | 132.5 ft (40.4 m) |
| Deck Width | 78.4 ft (23.9 m) |
| Deck Area | 1015.8 sq m |
| Main Spans | 1 |
| Year Built | 2013 |
Traffic
| Avg Daily Traffic | 17,900 (2023) |
| Truck Traffic | 7% |
| Lanes On Bridge | 4 |
Inspection & Ownership
| Last Inspection | 923 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 056007700000000 |