US 3 Nh 11 over Winnisquam Lake
Belknap County, New Hampshire · rated Good in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 3 Nh 11 over Winnisquam Lake in Belknap County, New Hampshire, 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 1973 and reconstructed in 2006, making it 52 years old at the 2025 inventory.
- It carries about 16,322 vehicles a day (traffic count year 2023).
- Its listed owner is the state highway agency.
- It is one of 65 of the 112 inventoried bridges in Belknap County rated good (58.0%); 5 (4.5%) 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 → (43.50212, -71.5117)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 7 | 7 | Good condition |
| Superstructure | 7 | 7 | Good condition |
| Substructure | 7 | 7 | Good condition |
Bridge details
| Structure | Continuous steel stringer or multi-beam girder |
| Length | about 474 ft |
| Location | Sanbornton-belmont Tl |
| NBI structure number | 023102310007300 |
| 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 Belknap County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 3 Nh 11 NH132 over I-93 | 2000 | 23,105 | Good |
| US 3 Nh 11 NH132 over Gulf Brook | 1936 | 23,105 | Fair |
| I-93 SB over NH104 NH132 | 1963 | 19,812 | Fair |
| NH106 Main St over Winnipesaukee River | 1970 | 18,507 | Fair |
| US 3 over Maple St Nhrr | 1947 | 17,943 | Good |
| I-93 NB over NH127 | 1962 | 15,080 | Good |
All bridges nearby: Belknap County, NH bridge conditions · every bridge in Belknap County · New Hampshire bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.