Total Bridges
2,542
Public highway bridges in New Hampshire
State profile · Near median Poor share
New Hampshire bridge safety
Condition ratings, load ratings, and Poor-condition data for every public highway bridge in New Hampshire, based on the FHWA National Bridge Inventory.
- 2,542
- Public bridges
- 43.0%
- Good condition
- 7.1%
- Poor condition
Data updated May 2026
Good Condition
43.0%
1,092 bridges rated 7-9
-7.0pp vs 50% benchmark
Poor Condition
7.1%
180 bridges whose lowest applicable component is rated 0-4
0.1pp vs national avg 7.0%
New Hampshire vs national bridge condition
New Hampshire - Good condition share 43.0%
National avg
Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).
New Hampshire - Poor-condition share 23.6%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
New Hampshire vs nearby ranks
Adjacent states by Poor-condition share (lower share = better)
States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below New Hampshire on the same metric.
NY
New York
6.90% top marginal rate
KY
Kentucky
7.06% top marginal rate
NH
New Hampshire
7.08% top marginal rate
OK
Oklahoma
7.50% top marginal rate
NM
New Mexico
7.61% top marginal rate
Bridges Needing Most Attention in New Hampshire
Six lowest-condition bridges in New Hampshire, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.
OLD DEERFIELD ROAD
PoorOver: BROOK
185 FT FROM NH RTE 43, Rockingham, NH
Built 1920 Load: 1.8 t ADT: 190
TEMPLETON TURNPIKE
PoorOver: PRIEST BROOK
1.9MI. RTE 119, Cheshire, NH
Built 1984 Load: 2.7 t ADT: 86
DUDLEY ROAD
PoorOver: LAMPREY RIVER
.23 MI JCT 101, Rockingham, NH
Built 1914 Load: 2.9 t ADT: 535
SHOP ROAD
PoorOver: NEEDLE SHOP BROOK
0.8 MI N NEW CHESTER RD, Merrimack, NH
Built 1930 Load: 3.3 t ADT: 63
WHITCOMB MILLS RD
PoorOver: WHITE BROOK
0.06 MI FR ARCH ST, Cheshire, NH
Built 1940 Load: 3.6 t ADT: 814
LEIGHTON MEADOW RD
PoorOver: PHILLIPS BROOK
100 FT FR SULLIVAN RD 61, Coos, NH
Built 1940 Load: 3.6 t ADT: 90
All Bridges in New Hampshire
NH 25
FairOver: HALLS BROOK
200 FT FROM NH RTE 25, Grafton, NH
Built 1964 Load: 47.7 t ADT: 4,731
NH 43,NH107
FairOver: LAMPREY RIVER
0.1 MI FROM JCT RTE 107A, Rockingham, NH
Built 1989 Load: 47.7 t ADT: 7,000
US 3
FairOver: AMMONOOSUC RIVER
1.9 MI BETHLEHEM TL, Coos, NH
Built 1972 Load: 48.0 t ADT: 5,127
NH 12
FairOver: MAPLE AVENUE
2.5 MI SURRY TL, Cheshire, NH
Built 1966 Load: 48.1 t ADT: 10,707
CONNECTOR ROAD
FairOver: PEMIGEWASSET RIVER
.04 MI S.E. JCT US 3, Grafton, NH
Built 1937 Load: 48.1 t ADT: 3,252
VALLEY ROAD
FairOver: SNOWS BROOK
5.2 MI E THORNTONTTL TL, Grafton, NH
Built 1985 Load: 48.4 t ADT: 576
ALVAH WILSON ROAD
FairOver: GUNSTOCK RIVER
0.29 MI FR NH RTE 11A, Belknap, NH
Built 1973 Load: 48.6 t ADT: 480
NH110
FairOver: NORTH BRANCH BROOK
0.8 MI FROM DUMMER TL, Coos, NH
Built 1954 Load: 48.8 t ADT: 1,676
NH 25,NH118
FairOver: BAKER RIVER
AT WENTWORTH TOWNLINE, Grafton, NH
Built 2006 Load: 49.0 t ADT: 2,099
SECOND STREET
FairOver: PISCATAQUOG (NORTH BR)
0.2 MI N QUEEN CITY BRDGE, Hillsborough, NH
Built 1915 Load: 49.0 t ADT: 6,373
I-93 SB
FairOver: COTTAGE STREET
0.4 MI BETHLEHEM TL, Grafton, NH
Built 1959 Load: 49.9 t ADT: 5,432
I-93 NB
FairOver: COTTAGE STREET
0.4 MI BETHLEHEM TL, Grafton, NH
Built 1959 Load: 49.9 t ADT: 4,854
WINTER STREET
FairOver: ROARING BROOK
0.3 MI E NH RTE 110, Coos, NH
Built 1956 Load: 50.0 t ADT: 579
NH 16,SP TPK
FairOver: NEW BELLAMY LANE
0.6 MI FROM JCT. RT. 16, Strafford, NH
Built 1955 Load: 50.2 t ADT: 41,164
WASHINGTON STREET
FairOver: CANAL INLET
0.6 MI FR US 3, Merrimack, NH
Built 1975 Load: 50.4 t ADT: 2,781
OLD TROY ROAD
FairOver: BROOK
2.25MI. MARLBORO TL, Cheshire, NH
Built 1940 Load: 50.8 t ADT: 90
US 3
FairOver: MERRIMACK RIVER
0.1 MI EAST JCT I-93, Merrimack, NH
Built 1998 Load: 50.8 t ADT: 26,107
GROUT HILL ROAD
FairOver: COLD RIVER
202 FT FROM JCT NH123A, Sullivan, NH
Built 1930 Load: 51.0 t ADT: 90
RAMP E(CAMP ST)
FairOver: CSX
0.3 MI W JCT US 3, Hillsborough, NH
Built 1970 Load: 51.1 t ADT: 6,427
MILL ROAD
FairOver: EXETER RIVER
.10 MI FROM RT 111-A, Rockingham, NH
Built 1967 Load: 51.1 t ADT: 442
GREENFIELD PARKWAY
FairOver: RIDDLE BROOK
.1 WEST OF LIBERTY HILL R, Hillsborough, NH
Built 2000 Load: 51.2 t ADT: 538
MINE ROAD
FairOver: POUCHAUG BROOK
0.18MI MASS. SL, Cheshire, NH
Built 1994 Load: 51.4 t ADT: 322
FAIRGROUNDS ROAD
FairOver: WEST BRANCH BROOK
1.9 MI FROM NEWBURY TL, Merrimack, NH
Built 2001 Load: 51.7 t ADT: 394
NH 16
FairOver: BRANCH RIVER
3.5MI FROM MILTON T.L., Carroll, NH
Built 1959 Load: 51.8 t ADT: 9,869
NH135
FairOver: AMMONOOSUC RIVER
Bath and Haverhill TL, Grafton, NH
Built 1998 Load: 51.8 t ADT: 1,526
NH 10
FairOver: ASHUELOT RIVER
3.2 MI NORTH OF KEENE TL, Cheshire, NH
Built 1935 Load: 51.9 t ADT: 3,259
COLLINS STREET
FairOver: SQUAM RIVER
0.4 MI FR NH RTE 132, Grafton, NH
Built 1983 Load: 52.3 t ADT: 459
US302
FairOver: CRAWFORD BROOK
2.4Mi E Harts Locat.T/L, Coos, NH
Built 1965 Load: 52.4 t ADT: 3,804
LADIEU ROAD
FairOver: BLOODS BROOK
55 FT FR HOUSER LN, Sullivan, NH
Built 1920 Load: 52.7 t ADT: 90
NH 12
FairOver: TARBELL BROOK
0.5 MI FROM MASS SL, Cheshire, NH
Built 1958 Load: 53.3 t ADT: 4,685
PROSPECT STREET
FairOver: AMMONOOSUC RIVER
6.6 MI FROM LITTLETON TL, Grafton, NH
Built 1928 Load: 53.4 t ADT: 175
CILLEYVILLE ROAD
FairOver: BLACKWATER RIVER
0.6 MI NH 11, Merrimack, NH
Built 1934 Load: 53.5 t ADT: 255
NH 12,NH103
FairOver: RED WATER BROOK
2.3 MI FROM VT. SL, Sullivan, NH
Built 1997 Load: 53.5 t ADT: 9,498
NH 27
FairOver: BEAN BROOK
1.4MI JCT RT 27, Rockingham, NH
Built 1937 Load: 53.7 t ADT: 3,419
I-93 SB
FairOver: COAL HILL RD,GALE RIVER
1.9 MI SUGARHILL TL, Grafton, NH
Built 1959 Load: 54.2 t ADT: 2,599
NH113
FairOver: CHOCORUA RIVER
5.1 MI NE JCT 25 & 113, Carroll, NH
Built 1925 Load: 54.5 t ADT: 2,127
NH120
FairOver: GREAT BROOK
1.0 MI FROM PLAINFIELD TL, Grafton, NH
Built 1930 Load: 54.5 t ADT: 2,614
DURAND ROAD
FairOver: CARLTON BROOK
0.2 MI FROM US RTE2, Coos, NH
Built 2010 Load: 54.7 t ADT: 256
NO DATA ENTERED
FairOver: JACKMAN BROOK
MAP 36, Grafton, NH
Built 1993 Load: 54.8 t ADT: 99
SCHOOL STREET
FairOver: NHRR
0.1 MI FROM US 3, Belknap, NH
Built 1924 Load: 54.9 t ADT: 1,377
TROY ROAD
FairOver: SHAKER BROOK
1.3 MI. FROM TROY TL, Cheshire, NH
Built 1939 Load: 55.1 t ADT: 479
NH 10
FairOver: JACOBS BROOK
3.4 MI FROM LYME TL, Grafton, NH
Built 1938 Load: 55.2 t ADT: 1,348
I-93,FEE TPK SB
FairOver: CSX
.2 MI N OF JCT RT 3-A, Merrimack, NH
Built 1957 Load: 55.3 t ADT: 37,721
I-93 NB
FairOver: US302,NH 10,NH 18,NH116
.1 MI.NO. BETHLEHEM TL, Grafton, NH
Built 1959 Load: 55.5 t ADT: 4,854
US 4
FairOver: NHRR
.1 MI FROM JCT. I-93, Merrimack, NH
Built 1958 Load: 55.5 t ADT: 7,347
WATER STREET
FairOver: WEST BRANCH BROOK
.12 MI FROM OLD WARREN R, Merrimack, NH
Built 1980 Load: 55.7 t ADT: 330
RUSSELL STATION RD
FairOver: RAND BROOK
0.67MI. NEW BOSTON TL, Hillsborough, NH
Built 1930 Load: 56.0 t ADT: 90
NH152
FairOver: PISCASSIC RIVER
2.3 MI E LEE TL, Rockingham, NH
Built 1946 Load: 56.2 t ADT: 2,468
I-93 SB
FairOver: NH141
4.2 MI SUGARHILL TL, Grafton, NH
Built 1959 Load: 56.5 t ADT: 2,411
NH103
FairOver: ANDREW BROOK
2.1 MI FROM BRADFORD T.L., Merrimack, NH
Built 1962 Load: 56.7 t ADT: 4,506
Showing 1,151-1,200 of 2,542 bridges
Related
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.
Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.
Understanding Bridge Conditions
How FHWA rates bridge condition on a 0-9 scale.
Check Your Daily Bridges
How to look up bridge condition data for bridges on your route.
Read our methodology — how this data is sourced, computed, and verified.
Every figure on PlainBridge is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.