NH110 over Upper Ammonoosuc River
Coos County, New Hampshire · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- NH110 over Upper Ammonoosuc River in Coos County, New Hampshire, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 6 (satisfactory condition) on the 0-9 scale.
- It was built in 1970, making it 55 years old at the 2025 inventory.
- It carries about 1,619 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 86 of the 189 inventoried bridges in Coos County rated fair (45.5%); 10 (5.3%) 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 June 2023, on a 24-month routine inspection cycle.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (44.5974, -71.30515)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 6 | 6 | Satisfactory condition |
| Superstructure | 6 | 6 | Satisfactory condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Steel stringer or multi-beam girder |
| Length | about 123 ft |
| Location | 0.9 Mi From Dummer Tl |
| NBI structure number | 017000770013300 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | June 2023 |
| 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 Coos County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 2 Nh 16 over Moose River | 1939 | 10,406 | Good |
| Nh 16 over Moose Brook | 1972 | 10,237 | Fair |
| US 3 NH116 NH142 over Johns River | 1938 | 9,718 | Fair |
| US 2 US 3 over Israel River | 1990 | 9,175 | Good |
| US 3 over Upper Ammonoosuc River | 1995 | 5,412 | Good |
| US 2 over Recreational Trail | 1960 | 5,195 | Good |
All bridges nearby: Coos County, NH bridge conditions · every bridge in Coos County · New Hampshire bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.