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
BREEZY POINT ROAD
FairOver: BAKER RIVER
0.01MI NH 118, Grafton, NH
Built 1930 Load: 18.1 t ADT: 162
ROADWAY
FairOver: ZEALAND RIVER
MAP 10, Grafton, NH
Built 1935 Load: 18.1 t ADT: 50
COOLEDGE ROAD
FairOver: SHEDD BROOK
1.2 MI. RTE. 31, Hillsborough, NH
Built 1956 Load: 18.1 t ADT: 343
E WASHINGTON ROAD
FairOver: BROOK
2.0 MI. WASHINGTON TL, Hillsborough, NH
Built 1953 Load: 18.1 t ADT: 215
WHITTEN ROAD
FairOver: TUCKER BROOK
1/4 MILE S OF SAVAGE RD, Hillsborough, NH
Built 1988 Load: 18.1 t ADT: 1,690
PURGATORY ROAD
FairOver: PURGATORY BROOK
0.2 MI FR LYNDEBOROUGH T, Hillsborough, NH
Built 1970 Load: 18.1 t ADT: 1,916
CEDAR ROAD
FairOver: CSX
0.18 MI FR LAFAYETTE RD, Rockingham, NH
Built 1920 Load: 18.1 t ADT: 2,088
MCCRILLIS ROAD
FairOver: NORTH RIVER
0.6 MI. RTE.152, Rockingham, NH
Built 1963 Load: 18.1 t ADT: 910
LUND ROAD
FairOver: SALMON BROOK
.1 MI W OF E DUNSTABLE RD, Hillsborough, NH
Built 1950 Load: 18.3 t ADT: 7,433
PINKHAM B ROAD
FairOver: BUMPUS BROOK
0.46 MI SE JCT US 2, Coos, NH
Built 1945 Load: 18.6 t ADT: 86
SOUTH VILLAGE ROAD
FairOver: SOUCOOK RIVER
2.6 MI FROM CONCORD TL, Merrimack, NH
Built 1926 Load: 18.6 t ADT: 3,594
OXBOW ROAD
FairOver: SUNCOOK RIVER
0.8 MI FR NH 28, Belknap, NH
Built 1924 Load: 18.8 t ADT: 90
TANDY BROOK ROAD
FairOver: MILL BROOK
2.1 MI FR CLAREMONT TL, Sullivan, NH
Built 1955 Load: 18.8 t ADT: 90
MCINDOES STREET
FairOver: CONNECTICUT RIVER
VERMONT STATE LINE, Grafton, NH
Built 1930 Load: 19.0 t ADT: 435
WEST BRANCH ROAD
FairOver: MAD RIVER
0.18 MI FROM NH RTE 49, Grafton, NH
Built 1950 Load: 19.1 t ADT: 145
NH112
FairOver: GORDON POND BROOK
0.3 MI WEST OF JCT RTE 3, Grafton, NH
Built 1940 Load: 19.1 t ADT: 2,740
US 3,NH 11
FairOver: WINNIPESAUKEE RIVER
5.2MI FROM FRANKLIN T.L., Merrimack, NH
Built 1940 Load: 19.1 t ADT: 13,926
COTTON ROAD
FairOver: BAKER BROOK
0.9 MI FROM SHAKER ST #8, Merrimack, NH
Built 1945 Load: 19.1 t ADT: 90
ISLAND STREET
FairOver: ASHUELOT RIVER
DOWNTOWN KEENE, Cheshire, NH
Built 1979 Load: 19.2 t ADT: 5,953
ELLSWORTH HILL RD
FairOver: POND BROOK
0.11 MI NH25, Grafton, NH
Built 1930 Load: 19.2 t ADT: 103
POOR FARM ROAD
FairOver: S BR PISCATAQUOG RIVER
0.8MI. RTE 136, Hillsborough, NH
Built 2004 Load: 19.2 t ADT: 172
DANIEL WEBSTER HWY
FairOver: NASHUA RIVER
0.02 MI FROM PEARSON AVE, Hillsborough, NH
Built 1925 Load: 19.2 t ADT: 16,408
NH 31
FairOver: ASHUELOT RIVER
1.85 MI. S. GOSHEN TL, Sullivan, NH
Built 1935 Load: 19.2 t ADT: 487
HADLEY ROAD
FairOver: CONTOOCOOK RIVER
0.9MI. TL PETERBORO, Cheshire, NH
Built 1939 Load: 19.4 t ADT: 67
LEWIS ROAD
FairOver: ASHUELOT RIVER
50 FT JCT NH 10, Cheshire, NH
Built 1960 Load: 19.4 t ADT: 90
MASON ROAD
FairOver: NISSITISSIT RIVER
.49 MI NW JCT 13, Hillsborough, NH
Built 1932 Load: 19.4 t ADT: 3,105
NH175
FairOver: MAD RIVER
6.6 MI N JCT US 3, Grafton, NH
Built 1927 Load: 19.8 t ADT: 1,912
NH149
FairOver: CONTOOCOOK RIVER
.1 MI. FROM JCT. US 202, Hillsborough, NH
Built 1893 Load: 19.8 t ADT: 4,440
NH 77 TRUCK ROUTE
FairOver: PISCATAQUOG RIVER
0.02 MI S JCT NH 77, Hillsborough, NH
Built 1940 Load: 19.8 t ADT: 3,283
NH 31
FairOver: STONY BROOK
0.4 MI FROM JCT RTE 101, Hillsborough, NH
Built 1905 Load: 19.8 t ADT: 2,840
FOWLERS MILL ROAD
FairOver: SWIFT RIVER
0.13 MI. RTE.113A, Carroll, NH
Built 1920 Load: 20.0 t ADT: 90
SODOM ROAD
FairOver: MELVIN RIVER
1.5 MI. RTE. 109A, Carroll, NH
Built 1970 Load: 20.0 t ADT: 526
SURRY RD
FairOver: ASHUELOT RIVER
2.52 MI E SURRY TL, Cheshire, NH
Built 1863 Load: 20.0 t ADT: 1,214
LARCOMB ROAD
FairOver: ISRAEL RIVER
0.2 MI FR NH RTE 115, Coos, NH
Built 1975 Load: 20.0 t ADT: 90
US 3
FairOver: CONNECTICUT RIVER
17.4 MI E OF ROUTE 145, Coos, NH
Built 1961 Load: 20.0 t ADT: 217
DELAGE FARM ROAD
FairOver: HAM BRANCH
0.43 MI. RTE 116, Grafton, NH
Built 2001 Load: 20.0 t ADT: 90
STINSON LAKE ROAD
FairOver: STINSON BROOK
1.8 MI JCT 25, Grafton, NH
Built 1955 Load: 20.0 t ADT: 840
CROSS ROAD
FairOver: S BR PISCATAQUOG RIVER
TOWN RD, Hillsborough, NH
Built 1930 Load: 20.0 t ADT: 90
LINK ROAD
FairOver: FERGUSON BROOK
0.3 MI FR NH RTE 123, Hillsborough, NH
Built 1995 Load: 20.0 t ADT: 105
CURRIER ROAD
FairOver: SOUCOOK RIVER
0.6 MI FR OLD NH 106, Merrimack, NH
Built 1930 Load: 20.0 t ADT: 90
TYLER ROAD
FairOver: BLACKWATER RIVER
3.0 MI N OF HOPKINTON TL, Merrimack, NH
Built 1951 Load: 20.0 t ADT: 270
PIERCES ISLAND RD
FairOver: LITTLE HARBOR
200 FT FROM MECHANIC ST, Rockingham, NH
Built 1958 Load: 20.0 t ADT: 1,243
COLD POND ROAD
FairOver: LITTLE SUGAR RIVER
2.3 MI. ACWORTH TL, Sullivan, NH
Built 1930 Load: 20.0 t ADT: 339
ROADWAY
FairOver: DECEPTION BROOK
MAP 11, Coos, NH
Built 1949 Load: 20.1 t ADT: 100
FDR 22
FairOver: TRIB. HUBBARD BROOK
MAP 36, Grafton, NH
Built 1966 Load: 20.1 t ADT: 99
DIAMOND POND ROAD
FairOver: E BRANCH MOHAWK RIVER
0.83 N JCT RT 26, Coos, NH
Built 1930 Load: 20.2 t ADT: 90
VALLEY ROAD
FairOver: REC TRAIL(RR BED)
0.2 MI NH 11, Merrimack, NH
Built 1930 Load: 20.2 t ADT: 90
PATTERSON HILL RD
FairOver: CONTOOCOOK RIVER
3.6 MI FR DEERING TL, Merrimack, NH
Built 1915 Load: 20.2 t ADT: 145
NH103,NH127
FairOver: CONTOOCOOK RIVER
1.6 MI S WARNER TL, Merrimack, NH
Built 1935 Load: 20.2 t ADT: 6,814
FDR 38
FairOver: SLIPPERY BROOK
MAP 24, Carroll, NH
Built 1963 Load: 20.4 t ADT: 50
Showing 501-550 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 |