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Bridge conditions in Hillsborough County, New Hampshire

385 inventoried bridges · 31 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Hillsborough County tracks close to typical: 31 of its 385 inventoried bridges (8.1%) are rated poor, against a national rate of about 7%.

31 of the 385 bridges in Hillsborough County, New Hampshire, are rated in poor condition (8.1%) in the 2025 National Bridge Inventory, as of August 20, 2026.
201 bridges (52.2%) are rated good and 153 (39.7%) fair.
The median Hillsborough County bridge was built in 1973.
The busiest poor-rated bridge is I-293 Fee Tpk over Stark Way (built 1956), carrying about 46,106 vehicles a day.

Good 52.2% · Fair 39.7% · Poor 8.1% of 385 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
I-293 Fee Tpk over Stark Way	1956	46,106	Poor
Fee Tpk SB over Pennichuck Brook	1954	44,365	Poor
I-293 Nh 3A Tpk N over Black Brook	1956	24,101	Poor
I-293 Nh 3A Tpk S over Black Brook	1956	22,005	Poor
Salmon Street EB over Merrimack R CSX Rd Ramp	1970	13,150	Poor
US 3 over Baboosic Brook	1933	13,024	Poor
Nh 13 over Souhegan River	1931	12,799	Poor
Baboosic Lake Road over Fee Tpk	1954	6,359	Poor
Main Street over Beaver Brook	1900	6,111	Poor
US202 NH123 over Contoocook River	1942	5,773	Poor
Nh 31 over Stony Brook	1929	3,496	Poor
Antrim Road over Monadnock Mill Canal	1922	2,233	Poor
Wilton Road over Souhegan River	1938	1,866	Poor
River Road over Piscataquog River	1940	1,866	Poor
Tirrell Hill Road over Black Brook	1994	1,387	Poor
Temple Road over Blood Brook	1901	1,167	Poor
Contoocook Falls R over Contoocook River	1933	712	Poor
Beaver Brook Road over Beaver Brook	1932	629	Poor
Greenfield Parkway over Riddle Brook	2000	571	Poor
Dupaw Gould Road over Lancy Brook	1987	559	Poor
Beals Road over Baboosic Brook	1928	511	Poor
Thorntons Ferry Rd over Beaver Brook	1970	356	Poor
Windy Row Road over Mcdowell Reservoir	1950	247	Poor
Liberty Farm Road over North Branch River	1991	96	Poor
Old County Rd N over Collins Brook	1981	96	Poor
Cressy Hill Road over Rand Brook	1940	96	Poor
Gleason Falls Road over Beards Brook	1900	96	Poor
Jones Road over Beards Brook	1900	96	Poor
Putnam Road over Brook	1930	96	Poor
Frye Mill Road over Burton Pond Outlet	1920	36	Poor
On-orbit Drive over Gardner-joe English Stre	1959	10	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
Fee Tpk N&S Ramps over Salmon Brook	1955	128,889	Good
Fee Tpk over Greeley Street	1993	78,063	Good
Fee Tpk over Souhegan River	1953	75,081	Good
Fee Tpk over Baboosic Brook	1954	75,081	Good
US 3 Fee Tpk NB over Nashua River	1955	73,979	Fair
US 3 Fee Tpk SB over Nashua River	1959	71,221	Good
I-293 Fee Tpk over N Br Piscataquog River	2016	69,164	Good
Fee Tpk NB Ramp 4 over Ramp 3B	1997	66,228	Good
I-293 Fee Tpk over S Br Piscataquog River	2016	63,919	Good
I-293 Fee Tpk over I-293 NB on Ramp	2016	63,919	Good

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Hillsborough County → - all 385, busiest first, each with its own condition record.

All of New Hampshire: New Hampshire bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.