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
MAIN STREET
FairOver: SUGAR RIVER
115 FT FROM GARNETT ST, Sullivan, NH
Built 1920 Load: 42.6 t ADT: 2,144
FDR 12
FairOver: BLUE BROOK
MAP 14, Coos, NH
Built 1947 Load: 42.8 t ADT: 50
US 3,FEE TPK NB
FairOver: NASHUA RIVER
0.3 MI FROM NH 130, Hillsborough, NH
Built 1955 Load: 42.8 t ADT: 71,603
GOLDMINE ROAD
FairOver: STANLEY BROOK
TOWN RD., Cheshire, NH
Built 1985 Load: 42.9 t ADT: 370
NH 16TRK, UNITY ST
FairOver: ANDROSCOGGIN RIVER
120FT FROM RTE 16, Coos, NH
Built 1982 Load: 43.3 t ADT: 3,983
NH 12A
FairOver: BLOOD BROOK
.4 MI. FROM PLAINFIELD TL, Grafton, NH
Built 1954 Load: 43.3 t ADT: 3,516
CHAPEL ROAD
FairOver: LOVELL RIVER
0.5 MI FR OSSIPEE RD, Carroll, NH
Built 1940 Load: 43.5 t ADT: 90
I-93 SB
FairOver: OWL STREET
0.7 MI THORNTON TL, Grafton, NH
Built 1968 Load: 43.5 t ADT: 7,500
I-93 PARKWAY
FairOver: TRAM ACCESS ROAD
2.2 MI. N. LINCOLN T.L., Grafton, NH
Built 1986 Load: 43.5 t ADT: 11,427
NH 16,SP TPK
FairOver: LONG HILL ROAD
1.5 MI. ROCHESTER TL., Strafford, NH
Built 1956 Load: 43.5 t ADT: 29,795
I-93 PARKWAY NB
FairOver: TRAIL,PEMIGEWASSET RIVER
5.0 MI NO WOODSTOCK TL, Grafton, NH
Built 1985 Load: 43.6 t ADT: 5,723
TRIPOLI ROAD
FairOver: MAD RIVER
.29 MI. FROM JCT. RTE. 49, Grafton, NH
Built 1968 Load: 43.7 t ADT: 409
NH136
FairOver: OTTER BROOK
1.9 MI E GREENFIELD TL, Hillsborough, NH
Built 1968 Load: 43.8 t ADT: 2,481
I-93 NB
FairOver: US 3
0.2 MI CAMPTON TL, Grafton, NH
Built 1968 Load: 43.9 t ADT: 7,928
I-89,NH 10
FairOver: BROOK,ATV TRAIL
0.4MI S LEBANON T/L, Grafton, NH
Built 1959 Load: 44.0 t ADT: 24,571
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.5 MI S JEFFERSON TL, Coos, NH
Built 1990 Load: 44.5 t ADT: 90
BLACKWATER ROAD
FairOver: CRYSTAL LAKE BROOK
0.8 MI FROM ENFIELD TL, Grafton, NH
Built 1988 Load: 44.5 t ADT: 470
BOSTON POST ROAD
FairOver: BEAVER BROOK
1.6 MI MONT VERNON TL, Hillsborough, NH
Built 1970 Load: 44.5 t ADT: 2,458
NH 28,S WILLOW ST
FairOver: COHAS BROOK
1.2 MI N LONDONDERRY TL, Hillsborough, NH
Built 1989 Load: 44.5 t ADT: 15,874
HILLDALE LANE
FairOver: S BR PISCATAQUOG RIVER
0.07 MI FR RIVER RD, Hillsborough, NH
Built 1920 Load: 44.5 t ADT: 90
TREMONT STREET
FairOver: CONTOOCOOK RIVER
CONCORD TL, Merrimack, NH
Built 1955 Load: 44.7 t ADT: 5,247
NH 97
FairOver: SPICKET RIVER
.5MI W MASS SL, Rockingham, NH
Built 1958 Load: 44.9 t ADT: 15,781
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.1 M S JEFFERSON TL, Coos, NH
Built 1939 Load: 45.3 t ADT: 90
GUILDHALL ROAD
FairOver: CONNECTICUT RIVER
VERMONT STATE LINE, Coos, NH
Built 1984 Load: 45.3 t ADT: 807
NH 63
FairOver: ASHUELOT RIVER
0.1 MI FROM JCT 119 & 63, Cheshire, NH
Built 1940 Load: 45.4 t ADT: 1,908
I-93 PARKWAY
FairOver: BIKE PATH, LAFAYETTE BK
3.3 MI N. LINCOLN TL, Grafton, NH
Built 1987 Load: 45.4 t ADT: 10,069
US 3,FEE TPK NB
FairOver: CANAL,SERVICE ROAD
0.5 MI FROM NH 130, Hillsborough, NH
Built 1955 Load: 45.4 t ADT: 57,702
I-93,FEE TPK NB
FairOver: CSX
.2MINJCT RT3-A, Merrimack, NH
Built 1957 Load: 45.4 t ADT: 41,887
BLACK HALL ROAD
FairOver: LITTLE SUNCOOK RIVER
.09 MI SW JCT US4, Merrimack, NH
Built 1924 Load: 45.5 t ADT: 2,085
COTTON ROAD
FairOver: LAMPREY RIVER
0.05 MI. RTE 107, Rockingham, NH
Built 1986 Load: 45.5 t ADT: 745
US 4
FairOver: NH155A
.5 MI. FROM LEE T.L., Strafford, NH
Built 1968 Load: 45.5 t ADT: 13,086
SOUTH RIVER ROAD
FairOver: GREAT BROOK
1.4 MI FR WESTMORELAND T, Cheshire, NH
Built 1950 Load: 45.7 t ADT: 119
US 4
FairOver: HUPPE BROOK
0.08 MI. FROM ENFIELD TL, Grafton, NH
Built 1945 Load: 45.7 t ADT: 10,800
PARKER ROAD
FairOver: S BR PISCATAQUOG RIVER
177 FT FR RIVER ROAD, Hillsborough, NH
Built 1937 Load: 45.7 t ADT: 1,174
MAIN STREET
FairOver: CSX,PEDESTRIAN
1.6 MI SE LEE T.L., Strafford, NH
Built 1936 Load: 45.9 t ADT: 7,598
NH123
FairOver: BAILEY BROOK
0.4 MI SE NELSON TL, Cheshire, NH
Built 1939 Load: 46.2 t ADT: 1,331
NO DATA ENTERED
FairOver: AMMONOOSUC RIVER
MAP 10, Grafton, NH
Built 2006 Load: 46.3 t ADT: 100
I-89 SB
FairOver: CONTOOCOOK RIVER
1.2 MI N.W. JCT RT 127, Merrimack, NH
Built 1959 Load: 46.5 t ADT: 11,347
NH286
FairOver: BLACKWATER RIVER
.1 MI JCT RT 1-A, Rockingham, NH
Built 1991 Load: 46.5 t ADT: 13,388
QUAKER WHITEFACE R
FairOver: WHITEFACE RIVER
0.45 MI. RTE. 113A, Carroll, NH
Built 1953 Load: 46.7 t ADT: 90
BORDEAU ROAD
FairOver: STRATFORD BOG BROOK
3.1 MI. US3, Coos, NH
Built 1970 Load: 46.7 t ADT: 90
NH 16
FairOver: CLAY BROOK
0.7 MI NE MARTINS LOC., Coos, NH
Built 1932 Load: 46.9 t ADT: 5,025
NH 12
FairOver: MILL BROOK
3.5 MI TO WALPOLE TL, Cheshire, NH
Built 1928 Load: 47.0 t ADT: 6,382
NH 11,NH103
FairOver: SUGAR RIVER,PED TRAIL
2.2 MI FROM CLAREMONT TL, Sullivan, NH
Built 1998 Load: 47.0 t ADT: 9,812
ROBINSON ROAD
FairOver: MOOSE BROOK
3.2 MI FROM GREENFIELD T, Hillsborough, NH
Built 1990 Load: 47.2 t ADT: 21
US 1
FairOver: TAYLOR RIVER
0.1 MI HAMPTON FALLS TL, Rockingham, NH
Built 1965 Load: 47.2 t ADT: 20,578
MARLOW ROAD
FairOver: ASHUELOT RIVER
TOWN RD 0.54 MI MARLOW TL, Sullivan, NH
Built 1920 Load: 47.4 t ADT: 64
US302
FairOver: ELLIS RIVER
0.20mi west of jct. NH16, Carroll, NH
Built 1998 Load: 47.7 t ADT: 6,003
US 4
FairOver: INDIAN RIVER
5.7 MI FROM ENFIELD TL, Grafton, NH
Built 1942 Load: 47.7 t ADT: 2,550
BOY'S CAMP ROAD
FairOver: BICKNELL BROOK
.9 MI FR NH RTE 4A, Grafton, NH
Built 1947 Load: 47.7 t ADT: 90
Showing 1,101-1,150 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 |