Belknap County Bridge Report Card

Belknap County scores 82 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

B82 / 100

Local infrastructure snapshot

Belknap County, New Hampshire

Belknap County has 112 bridges in the National Bridge Inventory, with 5 rated poor and 2 rated scour-critical. Its poor-condition share of 4.5% is at or below the 7.5% statewide average. Poor-condition bridges carry about 18,869 daily vehicle crossings.

112Total Bridges

5Poor (4.5%)

42Fair (37.5%)

2Scour-Critical

Quote-Ready Local Facts

4.5%of county bridges are in poor condition, compared with 7.5% statewide and 6.7% nationally.

18,869daily vehicle crossings are on poor-condition bridges in the county.

2bridges are rated scour-critical, or 1.8% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Belknap County a Bridge Condition Exposure Score of 82/100 (B). The county has 112 bridges in the National Bridge Inventory, including 5 in poor condition and 2 rated scour-critical. Poor-condition bridges carry about 18,869 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.

Download all county report-card scores as CSV.

How the Score Breaks Down

Factor	Weight	County Value	Penalty
Poor-condition bridge share	40	4.5%	8.9
Poor-condition traffic exposure	25	3.1% of measured traffic	2.3
Scour-critical bridge share	20	1.8%	3.6
Average age vs national baseline	10	55 years vs 48 nationally	3.0
Traffic-data completeness	5	612,516 measured daily crossings	0.0

Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.

County Comparisons

County Poor-Condition Share	4.5%
State Poor-Condition Share	7.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	1.8%
Average Bridge Age	55 years
Poor-Condition Traffic Exposure	18,869 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeNh 11 over Merrymeeting River — 10,346 vehicles/day Oldest Listed BridgeBelknap Mt Road over Gunstock River — built in 1900 All County BridgesBrowse every bridge record in Belknap County.

Top Bridges to Watch in Belknap County

Bridge	Reason	Condition	Daily Traffic	Year Built
Nh 11 over Merrymeeting River	Poor condition + traffic exposure	Poor	10,346	1934
Nh 11 over Poor Farm Brook	Poor condition + traffic exposure	Poor	5,227	1966
Nh 11b over Gunstock River	Poor condition + traffic exposure	Poor	2,690	1941
Centenary Avenue over Nhrr	Poor condition + traffic exposure	Poor	510	1940
Brook Road over Salmon Brook	Poor condition + traffic exposure	Poor	96	1900
Jamestown Road over Winnipesaukee River	Scour-critical foundation rating	Fair	3,412	1982
Parade Hill Road over Suncook River	Scour-critical foundation rating	Fair	427	1948
US 3 Nh 11 Nh132 over Gulf Brook	High traffic	Fair	23,105	1936
US 3 Nh 11 Nh132 over I-93	High traffic	Good	23,105	2000
I-93 SB over Nh104 Nh132	High traffic	Fair	19,812	1963

Important safety note

Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.