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
SLAB CITY ROAD
FairOver: SMITH BROOK
TOWN RD, Grafton, NH
Built 1930 Load: 16.3 t ADT: 90
WILD MEADOWS ROAD
FairOver: BROOK
TOWN RD, Grafton, NH
Built 1980 Load: 16.3 t ADT: 90
NORTH SHORE ROAD
FairOver: COCKERMOUTH RIVER
1.74 MI. FROM JCT RTE 3-A, Grafton, NH
Built 1930 Load: 16.3 t ADT: 1,455
BISHOP ROAD
FairOver: MILL BROOK
1.3 MI FROM LYMAN TL, Grafton, NH
Built 1970 Load: 16.3 t ADT: 115
RIVER ROAD
FairOver: SALMON HOLE BROOK
0.3 MI FROM NH RTE 117, Grafton, NH
Built 1920 Load: 16.3 t ADT: 250
BREEZY HILL ROAD
FairOver: SALMON HOLE BROOK
0.3 MI FROM GULF RD NO 6, Grafton, NH
Built 1975 Load: 16.3 t ADT: 90
MARKET STREET
FairOver: GRANT BROOK
4.0 MI FR HANOVER TL, Grafton, NH
Built 1974 Load: 16.3 t ADT: 71
NH175
FairOver: MILL BROOK
2.85 MI. N. OF CAMPTON TL, Grafton, NH
Built 1935 Load: 16.3 t ADT: 1,586
SHEDD ROAD
FairOver: SHEDD BROOK
0.2 MI FR NH RTE 31, Hillsborough, NH
Built 1919 Load: 16.3 t ADT: 90
LAWRENCE ROAD
FairOver: BLACKWATER RIVER
0.3 MI NH 11, Merrimack, NH
Built 1930 Load: 16.3 t ADT: 614
US 4
FairOver: BLACKWATER RIVER
1.7 MI FROM SALISBURY TL, Merrimack, NH
Built 1933 Load: 16.3 t ADT: 2,163
WILD MEADOW ROAD
FairOver: WILD MEADOW BROOK
0.3 MI GRAFTON TL, Merrimack, NH
Built 1950 Load: 16.3 t ADT: 90
WALKER BROOK ROAD
FairOver: FRAZIER BROOK
2.03 MI FR WILMOT TL, Merrimack, NH
Built 1950 Load: 16.3 t ADT: 90
US 3,NH 11
FairOver: WINNIPESAUKEE RIVER
4.8MI FROM FRANKLIN T.L., Merrimack, NH
Built 1922 Load: 16.3 t ADT: 12,725
NORTH ROAD
FairOver: MEADOW BROOK
2.46MI NH103, Merrimack, NH
Built 1939 Load: 16.3 t ADT: 90
BIBLE HILL LANE
FairOver: WARNER RIVER
0.01 MI FROM BRADFORD TL, Merrimack, NH
Built 1979 Load: 16.3 t ADT: 323
WASHINGTON STREET
FairOver: CSX
0.7 MI FROM JCT NH9, Strafford, NH
Built 1907 Load: 16.3 t ADT: 5,401
ROCHESTER NECK RD
FairOver: ISINGLASS RIVER
1.95 MI RTE 125, Strafford, NH
Built 1979 Load: 16.3 t ADT: 1,094
RIVER ROAD
FairOver: COLD RIVER
0.97 MI NO JCT NH 123A, Sullivan, NH
Built 1929 Load: 16.3 t ADT: 174
PLATT ROAD
FairOver: BLOW-ME-DOWN BROOK
0.9 MI FR PLAINFIELD TL, Sullivan, NH
Built 1930 Load: 16.3 t ADT: 81
CENTER ROAD
FairOver: MILL BROOK
3.5 MI N OF NH12A, Sullivan, NH
Built 1950 Load: 16.3 t ADT: 147
BROOK ROAD
FairOver: GUNNISON BROOK
.32 MI NE OF JCT NH 10, Sullivan, NH
Built 1940 Load: 16.3 t ADT: 991
STAGE ROAD
FairOver: LITTLE SUGAR RIVER
0.2 MI. CHARLESTOWN TL, Sullivan, NH
Built 1980 Load: 16.3 t ADT: 90
KNOWLTON STREET
FairOver: MINNEWAWA BROOK
60 FT FR NH RTE 101, Cheshire, NH
Built 1943 Load: 16.5 t ADT: 108
OLD ROXBURY ROAD
FairOver: MINNEWAWA BROOK
0.2 MI. RTE.101, Cheshire, NH
Built 1932 Load: 16.5 t ADT: 484
HIGH STREET
FairOver: NHRR(ABD)
0.04MI RTE 12, Cheshire, NH
Built 1953 Load: 16.5 t ADT: 1,236
SOUTH RIVER ROAD
FairOver: HOUGHTON BROOK
0.4 MI FR WESTMORELAND T, Cheshire, NH
Built 1980 Load: 16.5 t ADT: 115
DANFORTH CORNERS
FairOver: BEARDS BROOK
120 FT FR E WASHINGTON R, Hillsborough, NH
Built 1974 Load: 16.5 t ADT: 90
US 3
FairOver: LYMAN BROOK
0.7 MI NE STRATFORD TL, Coos, NH
Built 1952 Load: 16.7 t ADT: 3,114
NORTH ROAD
FairOver: BROOK
TOWN RD 0.80MI LYDBORO TL, Hillsborough, NH
Built 1940 Load: 16.7 t ADT: 151
FDR 34
FairOver: CARRIGAN BROOK
MAP 32, Carroll, NH
Built 1979 Load: 16.8 t ADT: 50
FDR 53
FairOver: MAD RIVER
MAP 38, Grafton, NH
Built 1957 Load: 16.8 t ADT: 50
NH 27
FairOver: LAMPREY RIVER
.6 MI E CANDIA TL, Rockingham, NH
Built 1932 Load: 16.8 t ADT: 2,583
MELLOON ROAD
FairOver: WILDCAT BROOK
370 FT FR NH RTE 16B, Carroll, NH
Built 1930 Load: 17.1 t ADT: 90
WILSON ROAD
FairOver: GREAT BROOK
0.3 MI FR BARTLETT TL, Carroll, NH
Built 1981 Load: 17.1 t ADT: 131
NORTH SHORE ROAD
FairOver: GRANITE LAKE INLET
0.13 MI FROM NH RTE 9, Cheshire, NH
Built 1920 Load: 17.1 t ADT: 90
FELCH ROAD
FairOver: LION BROOK
0.4 MI FROM KEYSER ST, Merrimack, NH
Built 1983 Load: 17.1 t ADT: 90
HANCOCK ROAD
FairOver: NUBANUSIT BROOK
320 FT FR HARRISVILLE RD, Cheshire, NH
Built 1925 Load: 17.2 t ADT: 600
HANCOCK ROAD
FairOver: NUBANUSIT BROOK
.07 MI FR HANCOCK TL, Cheshire, NH
Built 1925 Load: 17.2 t ADT: 90
NH 12
FairOver: MILL POND
1.37 MI. FITZWILLIAM TL, Cheshire, NH
Built 1928 Load: 17.2 t ADT: 7,947
PEARL LAKE ROAD
FairOver: PEARL LAKE BROOK
0.7 MI FR NH RTE 112, Grafton, NH
Built 1928 Load: 17.2 t ADT: 1,214
GROVE STREET
FairOver: NUBANUSIT BROOK
0.4 MI FR NH RTE 123, Hillsborough, NH
Built 1936 Load: 17.3 t ADT: 4,480
CARTLAND ROAD
FairOver: LITTLE RIVER
1.9 MI FR NH RTE 152, Strafford, NH
Built 1957 Load: 17.3 t ADT: 160
MARLBORO STREET
FairOver: BEAVER BROOK
0.4 MI EAST JCT NH 10, Cheshire, NH
Built 1978 Load: 17.5 t ADT: 4,166
NORTH DORCHESTER R
FairOver: S BRANCH BAKER RIVER
0.97MI. DORCHESTER TL, Grafton, NH
Built 1949 Load: 17.5 t ADT: 141
ZACCARIA ROAD
FairOver: SMITH RIVER
0.15 MI SOUTH US 4, Merrimack, NH
Built 1950 Load: 17.8 t ADT: 90
NH 11
FairOver: WEST ALTON BROOK
1.9 MI SE GILFORD TL, Belknap, NH
Built 1923 Load: 18.0 t ADT: 5,054
HOWARD ROAD
FairOver: ASHUELOT RIVER
TOWN RD, Cheshire, NH
Built 1945 Load: 18.0 t ADT: 24
US202
FairOver: MILL TAIL RACE
1.7 MI TO PETERBORO TL, Cheshire, NH
Built 1937 Load: 18.1 t ADT: 7,296
BRISTOL HILL ROAD
FairOver: NEWFOUND RIVER
0.9 MI ALEXANDRIA TL, Grafton, NH
Built 1982 Load: 18.1 t ADT: 1,497
Showing 451-500 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.