Griffin Hill Road over Warren Brook
Cheshire County, New Hampshire · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Griffin Hill Road over Warren Brook in Cheshire County, New Hampshire, is rated in good condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the substructure, rated 7 (good condition) on the 0-9 scale.
- It was built in 1920 and reconstructed in 2004, making it 105 years old at the 2025 inventory.
- It carries about 96 vehicles a day (traffic count year 2023).
- Its listed owner is a city or municipal highway agency.
- It is one of 82 of the 194 inventoried bridges in Cheshire County rated good (42.3%); 22 (11.3%) 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 2024, 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 → (43.14944, -72.33577)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 8 | 8 | Very good condition |
| Superstructure | 8 | 8 | Very good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Concrete slab |
| Length | about 35 ft |
| Location | 0.05 Mi N of Nh 123 |
| NBI structure number | 000500860015800 |
| Condition class | Good |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| 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 New Hampshire department of transportation.
Busiest bridges in Cheshire County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Nh 12 NH101 over Ashuelot River Ped Trail | 1961 | 22,780 | Fair |
| Nh 9 over Ash Swamp Brook | 2006 | 22,417 | Good |
| Nh 12 over Beaver Brook | 2019 | 17,831 | Good |
| Nh 12 over Branch River | 1994 | 17,831 | Good |
| West Street over Ashuelot River | 1952 | 16,605 | Fair |
| Nh 9 Nh 10 Nh 12 over West Street | 1967 | 16,222 | Good |
All bridges nearby: Cheshire County, NH bridge conditions · every bridge in Cheshire County · New Hampshire bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.