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
NH 16B
FairOver: WILDCAT BROOK
2.2 MI JCT 16A, Carroll, NH
Built 1964 Load: 26.5 t ADT: 151
GILMORE POND ROAD
FairOver: MOUNTAIN BROOK
0.6 MI FROM NH RTE 124, Cheshire, NH
Built 1920 Load: 26.5 t ADT: 619
OLD NH 9
FairOver: BEARDS BROOK
0.3MI JCT 9-31-202, Hillsborough, NH
Built 1951 Load: 26.5 t ADT: 2,998
NH111
FairOver: NASHUA RIVER
.7 MI FROM NASHUA TL, Hillsborough, NH
Built 1950 Load: 26.5 t ADT: 12,691
PIPER POND RD
FairOver: BROOK
TOWN RD, Merrimack, NH
Built 1983 Load: 26.5 t ADT: 90
NH125
FairOver: EXETER RIVER
.03 MI FR NH 111 A, Rockingham, NH
Built 1960 Load: 26.5 t ADT: 11,753
NH113A
FairOver: WHITEFACE RIVER
2.1 MI W TAMWORTH TL, Carroll, NH
Built 1941 Load: 26.6 t ADT: 250
OWEN ROAD
FairOver: BISHOP BROOK
0.3 MI FR BISHOP BROOK R, Coos, NH
Built 1915 Load: 26.6 t ADT: 90
FDR 15
FairOver: KEENAN BROOK
MAP 02, Coos, NH
Built 1964 Load: 26.6 t ADT: 99
EASTERN DIST ROAD
FairOver: SMITH RIVER
.07 MI FR SUNAPEE LAKE R, Merrimack, NH
Built 1949 Load: 26.6 t ADT: 139
NH140
FairOver: MERRYMEETING RIVER
3.1 MI FROM GILMANTON TL, Belknap, NH
Built 1940 Load: 26.8 t ADT: 2,433
NH110
FairOver: UPPER AMMONOOSUC RIVER
0.9 MI FROM DUMMER TL, Coos, NH
Built 1970 Load: 26.8 t ADT: 1,603
US 3
FairOver: NHRR
0.6 MI FROM VERMONT SL, Coos, NH
Built 1970 Load: 26.8 t ADT: 2,906
NH 31
FairOver: SOUHEGAN RIVER
.3 MI FROM GREENVILLE TL, Hillsborough, NH
Built 1951 Load: 26.8 t ADT: 4,450
NH 9
FairOver: MALLEGO BROOK
1.2MI FROM BARRINGTON TL, Strafford, NH
Built 1960 Load: 26.8 t ADT: 7,882
WEST SIDE ROAD
FairOver: LUCY BROOK
0.7 MI BARTLETT TL, Carroll, NH
Built 1976 Load: 26.9 t ADT: 3,201
NH 16
FairOver: SACO RIVER
1.6MI ALBANY TL, Carroll, NH
Built 1945 Load: 26.9 t ADT: 12,067
BRIDGE STREET
FairOver: ANDROSCOGGIN RIVER
0.17 MI JCT RTE 16, Coos, NH
Built 1969 Load: 26.9 t ADT: 975
US 3,NH 25
FairOver: PEMIGEWASSET RIVER,NHRR
BRIDGEWATER TL, Grafton, NH
Built 1937 Load: 26.9 t ADT: 2,614
GREAT HOLLOW ROAD
FairOver: MINK BROOK
.76 MI N LEBANON TL, Grafton, NH
Built 1901 Load: 26.9 t ADT: 2,125
CENTER HILL ROAD
FairOver: LITTLE SUNCOOK RIVER
200FT NH9, Merrimack, NH
Built 1978 Load: 26.9 t ADT: 90
NH114
FairOver: CONTOOCOOK RIVER
0.1 MI S OF JCT RTE 202, Merrimack, NH
Built 1939 Load: 26.9 t ADT: 4,676
NH113A
FairOver: WONALANCET RIVER
3.4 MI FROM SANDWICH TL, Carroll, NH
Built 1965 Load: 27.1 t ADT: 251
NH 16A
FairOver: WILDCAT BROOK
.55 MI N. JCT 16, Carroll, NH
Built 1931 Load: 27.2 t ADT: 1,482
NH 16
FairOver: ELLIS RIVER
1.5 MI JACKSON TL, Coos, NH
Built 1963 Load: 27.2 t ADT: 3,317
US 3
FairOver: BAGLEY BROOK
3.5 MI FROM CAMPTON TL, Grafton, NH
Built 1933 Load: 27.2 t ADT: 1,272
NH118
FairOver: LOST RIVER
0.1 MI W OF JCT RTE 112, Grafton, NH
Built 1941 Load: 27.2 t ADT: 504
NH 28 BYPASS
FairOver: COHAS BROOK
4.45 MI S AUBURN TL., Rockingham, NH
Built 1937 Load: 27.2 t ADT: 7,113
NH 26
FairOver: MOHAWK RIVER
3.5 MI WEST DIXVILLE TL, Coos, NH
Built 1929 Load: 27.3 t ADT: 1,584
US 3
FairOver: WEST BRANCH BROOK
0.6 MI FROM THORNTON TL, Grafton, NH
Built 1927 Load: 27.3 t ADT: 1,117
NH116
FairOver: HAM BRANCH
1.0 MI S. FRANCONIA T.L., Grafton, NH
Built 1933 Load: 27.3 t ADT: 824
NH 43
FairOver: NORTH BRANCH RIVER
.3 MI FROM RAYMOND TL, Rockingham, NH
Built 1961 Load: 27.3 t ADT: 5,527
MILL BROOK ROAD
FairOver: MILL BROOK
3.3 MI S. JCT. 302, Grafton, NH
Built 1928 Load: 27.4 t ADT: 174
I-89 NB
FairOver: NH114
1.9MI NEW LONDON T.L., Merrimack, NH
Built 1967 Load: 27.4 t ADT: 9,260
WYMAN AVE
FairOver: PISCATAQUA RIV BACK CHNL
0.1 KM SOUTH OF SR 103, Rockingham, NH
Built 1941 Load: 27.5 t ADT: 4,000
NH 25C
FairOver: EASTMAN BROOK
4.11 MI. NW OF WARREN TL, Grafton, NH
Built 1949 Load: 27.6 t ADT: 442
TANNERY LANE
FairOver: TANNERY POND OUTLET
170 FT. FROM VILLAGE ROAD, Merrimack, NH
Built 1910 Load: 27.6 t ADT: 90
WEBSTER GROVES RD
FairOver: COUNTRY POND OUTLET
KINGSTON TL, Rockingham, NH
Built 1980 Load: 27.6 t ADT: 10
MARKET STREET EB
FairOver: TIDAL BASIN
.5 MI E JCT I-95, Rockingham, NH
Built 1971 Load: 27.6 t ADT: 8,968
GREGG MILL ROAD
FairOver: S BR PISCATAQUOG RIVER
164 FT FR RIVER ROAD, Hillsborough, NH
Built 1938 Load: 27.7 t ADT: 606
NORTH ROAD
FairOver: ANDROSCOGGIN RIVER
0.26 MI N US 2, Coos, NH
Built 1973 Load: 27.8 t ADT: 278
TOWN FOREST ROAD
FairOver: COCKERMOUTH RIVER
0.1 MI FROM GROTON ROAD, Grafton, NH
Built 2007 Load: 27.8 t ADT: 50
NH175
FairOver: PEMIGEWASSET RIVER
0.5 MI EAST JCT US 3, Grafton, NH
Built 1976 Load: 27.8 t ADT: 672
HANNAH NUTTER ROAD
FairOver: BIG RIVER
0.1 MI FR NEW ROCHESTER, Belknap, NH
Built 1940 Load: 27.9 t ADT: 90
NH 25
FairOver: RED HILL RIVER
3.8 MI FROM CTR HARBOR TL, Carroll, NH
Built 1940 Load: 27.9 t ADT: 9,727
NH 63
FairOver: MILL BROOK
1.3 MI FROM JCT RTE 12, Cheshire, NH
Built 1930 Load: 27.9 t ADT: 1,029
US 4
FairOver: INDIAN RIVER
4.9 MILES FROM ENFIELD TL, Grafton, NH
Built 1978 Load: 27.9 t ADT: 5,839
PAYNE ROAD
FairOver: MASCOMA RIVER
.19 MI. FROM JCT. US 4, Grafton, NH
Built 1938 Load: 27.9 t ADT: 182
NH113
FairOver: FORREST BROOK
1.9 MI NE TAMWORTH TL, Carroll, NH
Built 1955 Load: 28.0 t ADT: 2,751
GOV'NRS ISLAND RD
FairOver: LAKE WINNIPESAUKEE
AT LACONIA/GILFORD TL, Belknap, NH
Built 1981 Load: 28.1 t ADT: 1,682
Showing 701-750 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 |