Total Bridges
2,542
Public highway bridges in New Hampshire
State profile · Near national median SD
New Hampshire bridge safety
Condition ratings, load ratings, and structural-deficiency data for every public highway bridge in New Hampshire — drawn straight from the FHWA National Bridge Inventory.
- 2,542
- Public bridges
- 43.0%
- Good condition
- 7.1%
- Poor condition
- 7.1%
- Structurally deficient
Good Condition
43.0%
1,092 bridges rated 7-9
-7.0pp vs 50% benchmark
Poor Condition
7.1%
180 bridges rated 0-4
Structurally Deficient
7.1%
180 bridges flagged for repair priority
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 — Structurally deficient share 23.6%
National avg
Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.0%.
Condition Distribution
Bridge inventory deck-condition mix — New Hampshire (FHWA NBI)
New Hampshire vs nearby ranks
Adjacent states on the structurally deficient leaderboard (lower share = better)
States are ranked by share of bridges flagged structurally deficient — the FHWA classification for any span where deck, superstructure, or substructure carries a condition rating of 4 or below. Lower percentages indicate stronger maintenance funding and inspection follow-through. States here sit immediately above and below New Hampshire on the same metric.
36
New York
6.90% top marginal rate
21
Kentucky
7.06% top marginal rate
33
New Hampshire
7.08% top marginal rate
40
Oklahoma
7.50% top marginal rate
35
New Mexico
7.61% top marginal rate
Bridges Needing Most Attention in New Hampshire
Six lowest-condition bridges in New Hampshire, ranked by composite NBI rating. Each is inspected at least every 24 months.
OLD DEERFIELD ROAD
PoorOver: BROOK
185 FT FROM NH RTE 43, Rockingham, NH
Built 1920 Load: 1.8 t ADT: 190
TEMPLETON TURNPIKE
Structurally DeficientOver: PRIEST BROOK
1.9MI. RTE 119, Cheshire, NH
Built 1984 Load: 2.7 t ADT: 86
DUDLEY ROAD
Structurally DeficientOver: LAMPREY RIVER
.23 MI JCT 101, Rockingham, NH
Built 1914 Load: 2.9 t ADT: 535
SHOP ROAD
Structurally DeficientOver: 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
Structurally DeficientOver: 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
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges Editorial.
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). A "structurally deficient" rating is a repair-priority signal, not a closure or unsafe-to-cross designation. Consult a qualified civil engineer before making decisions based on this data.
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.
| Publisher | Kiznis Studio |
| Sources | FHWA National Bridge Inventory, public U.S. government datasets |