County Road Z7 over Trinchera Creek
Costilla County, Colorado · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- County Road Z7 over Trinchera Creek in Costilla County, Colorado, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 7 (good condition) on the 0-9 scale.
- It was built in 1988 and reconstructed in 2018, making it 37 years old at the 2025 inventory.
- It carries about 124 vehicles a day (traffic count year 2022).
- Its listed owner is the county highway agency.
- It is one of 4 of the 38 inventoried bridges in Costilla County rated good (10.5%); 0 (0.0%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- It was rated fair in the 2024 inventory and is now good (superstructure 6 to 7, substructure 7 to 8).
- Its most recent inspection on record is dated March 2025, on a 24-month routine inspection cycle.
- A good rating means every major component - deck, superstructure, substructure, or culvert - is rated 7 or higher on FHWA's 0-9 scale: no more than minor problems.
View this bridge on a map → (37.39436, -105.36825)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 6 | 7 | Good condition |
| Substructure | 7 | 8 | Very good condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 26 ft |
| Location | 3.0 Mi SE of SH 160 |
| NBI structure number | CSZ7-S0.2-TRR |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | March 2025 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 5: foundations stable, scour within the limits of the footing or piles |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Colorado department of transportation.
Busiest bridges in Costilla County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 160 Ml over Canal | 1970 | 5,000 | Good |
| County Road P.6 over Unnamed Drainage | 2006 | 1,230 | Fair |
| SH 159 Ml over Culebra Creek | 1936 | 800 | Fair |
| C.rd Trinchera over Sangre De Cristo Creek | 1989 | 531 | Fair |
| County Road 21 over Culebra Creek | 1955 | 475 | Fair |
| SH 142 Ml over Rito Seco Creek | 1936 | 440 | Good |
All bridges nearby: Costilla County, CO bridge conditions · every bridge in Costilla County · Colorado bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.