Hillsborough County Bridge Report Card

Hillsborough County scores 72 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.

C72 / 100

Local infrastructure snapshot

Hillsborough County, New Hampshire

Hillsborough County has 385 bridges in the National Bridge Inventory, with 31 rated poor and 12 rated scour-critical. Its poor-condition share of 8.1% is above the 7.5% statewide average. Poor-condition bridges carry about 210,015 daily vehicle crossings.

385Total Bridges

31Poor (8.1%)

153Fair (39.7%)

12Scour-Critical

Quote-Ready Local Facts

8.1%of county bridges are in poor condition, compared with 7.5% statewide and 6.7% nationally.

210,015daily vehicle crossings are on poor-condition bridges in the county.

12bridges are rated scour-critical, or 3.1% of the county bridge inventory.

Copyable Facts for Reporters

BridgeLookup.com gives Hillsborough County a Bridge Condition Exposure Score of 72/100 (C). The county has 385 bridges in the National Bridge Inventory, including 31 in poor condition and 12 rated scour-critical. Poor-condition bridges carry about 210,015 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	8.1%	16.1
Poor-condition traffic exposure	25	4.7% of measured traffic	3.5
Scour-critical bridge share	20	3.1%	6.2
Average age vs national baseline	10	53 years vs 48 nationally	2.0
Traffic-data completeness	5	4,511,829 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	8.1%
State Poor-Condition Share	7.5%
National Poor-Condition Share	6.7%
County Scour-Critical Share	3.1%
Average Bridge Age	53 years
Poor-Condition Traffic Exposure	210,015 vehicles/day

Bridges to Watch

Busiest Poor-Condition BridgeI-293 Fee Tpk over Stark Way — 46,106 vehicles/day Oldest Listed BridgeAllds Street over Salmon Brook — built in 1892 All County BridgesBrowse every bridge record in Hillsborough County.

Top Bridges to Watch in Hillsborough County

Bridge	Reason	Condition	Daily Traffic	Year Built
Main Street over Beaver Brook	Poor condition + traffic exposure	Poor	6,111	1900
Us202 Nh123 over Contoocook River	Poor condition + traffic exposure	Poor	5,773	1942
Contoocook Falls R over Contoocook River	Poor condition + traffic exposure	Poor	712	1933
Jones Road over Beards Brook	Poor condition + traffic exposure	Poor	96	1900
Liberty Farm Road over North Branch River	Poor condition + traffic exposure	Poor	96	1991
I-293 Fee Tpk over Stark Way	Poor condition + traffic exposure	Poor	46,106	1956
Fee Tpk SB over Pennichuck Brook	Poor condition + traffic exposure	Poor	44,365	1954
I-293 Nh 3a Tpk N over Black Brook	Poor condition + traffic exposure	Poor	24,101	1956
I-293 Nh 3a Tpk S over Black Brook	Poor condition + traffic exposure	Poor	22,005	1956
Salmon Street EB over Merrimack R Csx RD Ramp	Poor condition + traffic exposure	Poor	13,150	1970

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.