Structure 91100041802034 · Hill County, TX
Carries SH 171 over Mitchell Grove Branch, 1.5 Mi N Of SH 31.
A culvert 21 ft across with 2 openings. Lengths are drawn to scale; at this length a semi-truck would be a speck. Each part is colored by its latest inspection rating. The inventory records lengths but not heights, so those are drawn as typical for a culvert.
| State | Texas |
| County | Hill |
| Location | 1.5 Mi N Of SH 31 |
| Carries | SH 171 |
| Crosses | Mitchell Grove Branch |
| Coordinates | 31.86710, -96.81126 |
| Material | Concrete |
| Design | Culvert |
| Total Length | 21.0 ft (6.4 m) |
| Max Span | 9.8 ft (3 m) |
| Deck Width | 44.6 ft (13.6 m) |
| Deck Area | 87.0 sq m |
| Main Spans | 2 |
| Year Built | 1940 |
| Avg Daily Traffic | 2,545 (2020) |
| Truck Traffic | 22% |
| Lanes On Bridge | 2 |
| Last Inspection | January 2023 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is possibly eligible (requires evaluation) |
| Scour Critical | 8 — Stable, low risk |
| Structure Number | 091100041802034 |
Inspectors rate each major part of a bridge (the deck you drive on, the superstructure of beams that holds it up, and the substructure of piers and abutments beneath) on a 0–9 scale. A bridge's overall condition is its lowest of those ratings, so one deteriorated component makes the whole bridge "poor."
A poor rating is not a closure. It means the bridge is flagged for priority repair or replacement; bridges judged unsafe are closed or posted with weight limits. The waterway (channel) rating is reported, but it does not count toward the overall classification.