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
NORTH ROAD
FairOver: SMITH RIVER
.36 MI. NW JCT. 104 AND 4, Merrimack, NH
Built 1936 Load: 24.5 t ADT: 501
US 4
FairOver: NHRR(ABD)
2.4 MI FROM WILMOT TL, Merrimack, NH
Built 1937 Load: 24.5 t ADT: 2,454
CLOUGH HILL ROAD
FairOver: SOUCOOK RIVER
0.1 MI FR NH 106, Merrimack, NH
Built 1960 Load: 24.5 t ADT: 1,627
NH 1B
FairOver: PISCATAQUA ESTUARY
1.1 MI FROM JCT RT 1A, Rockingham, NH
Built 1955 Load: 24.5 t ADT: 2,973
EPPING STREET
FairOver: LAMPREY RIVER
0.3 MI FROM NH RTE 107, Rockingham, NH
Built 1948 Load: 24.5 t ADT: 2,762
NH152
FairOver: LAMPREY RIVER
1.0 MI FROM NEWMARKET TL, Strafford, NH
Built 1933 Load: 24.5 t ADT: 1,860
CITIZENS STREET
FairOver: SUGAR RIVER
100 FT JCT RTE 12, Sullivan, NH
Built 1959 Load: 24.5 t ADT: 1,325
FDR 30
FairOver: MAD RIVER
MAP 38, Grafton, NH
Built 1949 Load: 24.6 t ADT: 50
US 3,NH 25
FairOver: BAKER RIVER
4.3 MI FM BRIDGEWATER TL, Grafton, NH
Built 1930 Load: 24.7 t ADT: 4,270
NH101
FairOver: JOE ENGLISH BROOK
1.15 MI SW BEDFORD TL, Hillsborough, NH
Built 1936 Load: 24.7 t ADT: 17,501
US202
FairOver: CSX
.1 MI. WEST OF JCT I-93, Merrimack, NH
Built 1949 Load: 24.7 t ADT: 44,531
NO DATA ENTERED
FairOver: CLAYBANK BROOK
NO DATA ENTERED, Carroll, NH
Built 1974 Load: 24.9 t ADT: 99
US 3
FairOver: CONE BROOK
3.7 MI NE STRATFORD TL, Coos, NH
Built 1952 Load: 24.9 t ADT: 3,178
BASE STATION ROAD
FairOver: BLACK BROOK
2.98 MI NE JCT RTE US 302, Coos, NH
Built 1934 Load: 24.9 t ADT: 1,775
NH110
FairOver: MILL BROOK
3.8 MI NORTHUMBERLAND TL, Coos, NH
Built 1963 Load: 24.9 t ADT: 1,923
FDE 92
FairOver: S.BR.GALE RIVER
MAP 19, Grafton, NH
Built 1972 Load: 24.9 t ADT: 50
LAKE SHORE DRIVE
FairOver: SUCKER BROOK
.37 MI. N. OF JCT. NH 11, Merrimack, NH
Built 1942 Load: 24.9 t ADT: 363
CRAIG ROAD
FairOver: STANLEY BROOK
0.5 MI. RTE 137, Cheshire, NH
Built 1935 Load: 25.1 t ADT: 232
NH 63
FairOver: KILBURN BROOK
4.4 MI S CHESTERFIELD TL, Cheshire, NH
Built 1936 Load: 25.1 t ADT: 1,619
GREAT BROOK ROAD
FairOver: GREAT BROOK
380 FT FR NH RTE 120, Grafton, NH
Built 1936 Load: 25.1 t ADT: 105
NH 31
FairOver: BLOOD BROOK
0.2 MI FROM JCT RTE 101, Hillsborough, NH
Built 1937 Load: 25.1 t ADT: 4,322
NH104
FairOver: SMITH RIVER
1.0 MI FROM HILL TL, Merrimack, NH
Built 1940 Load: 25.1 t ADT: 3,469
NH120
FairOver: BLOW-ME-DOWN BROOK
0.8 MI FROM PLAINFIELD TL, Sullivan, NH
Built 1933 Load: 25.1 t ADT: 2,172
NH112,LOST RIV RD
FairOver: CLAY BROOK
3.5 MI FROM LANDAFF TL, Grafton, NH
Built 1932 Load: 25.2 t ADT: 1,652
BUTTER HILL ROAD
FairOver: MCDONOUGH BROOK
0.4 MI FR NH RTE 113, Carroll, NH
Built 1955 Load: 25.3 t ADT: 90
NUTTING ROAD
FairOver: CONTOOCOOK RIVER
215 FT FR NH RTE 137, Cheshire, NH
Built 1905 Load: 25.3 t ADT: 90
BESSIE PIERCE ROAD
FairOver: PARTRIDGE BROOK
1.48MI NH 63, Cheshire, NH
Built 1936 Load: 25.3 t ADT: 10
NO DATA ENTERED
FairOver: INDIGO SALE
NO DATA ENTERED, Grafton, NH
Built 2015 Load: 25.3 t ADT: 99
EAST MADISON ROAD
FairOver: FORREST BROOK
420 FT FROM NH RTE 113 ^, Carroll, NH
Built 1958 Load: 25.4 t ADT: 842
OLD COUNTY RD S
FairOver: BRENNAN BROOK
TOWN RD, Hillsborough, NH
Built 1930 Load: 25.4 t ADT: 27
NH111A
FairOver: LITTLE RIVER
1.75 MI. TO BRENTWOOD TL, Rockingham, NH
Built 1934 Load: 25.4 t ADT: 2,463
NH108
FairOver: EXETER RIVER
0.3 MI FROM KENSINGTON TL, Rockingham, NH
Built 1935 Load: 25.4 t ADT: 5,591
WESTPORT ROAD
FairOver: ASHUELOT RIVER
.68 MI NE WINCHESTER TL, Cheshire, NH
Built 1862 Load: 25.5 t ADT: 780
NH111A
FairOver: DUDLEY BROOK
.6 MI. FROM BRENTWOOD TL, Rockingham, NH
Built 1936 Load: 25.5 t ADT: 1,626
NO DATA ENTERED
FairOver: INDIGO SALE
NO DATA ENTERED, Grafton, NH
Built 2008 Load: 25.6 t ADT: 99
FDR 229
FairOver: MOOSILAUKE BROOK
MAP 29, Grafton, NH
Built 1979 Load: 25.6 t ADT: 50
JIM TOWN ROAD
FairOver: MOOSE BROOK
0.45 MI W JCT US 2, Coos, NH
Built 1975 Load: 25.7 t ADT: 604
NH 28A,MAMMOTH RD
FairOver: COHAS BROOK
1.3 MI N LONDONDERRY TL, Hillsborough, NH
Built 1935 Load: 25.7 t ADT: 11,711
ALLDS STREET
FairOver: SALMON BROOK
.2 MI E OF MAIN ST, Hillsborough, NH
Built 1892 Load: 25.7 t ADT: 8,913
MARKET STREET WB
FairOver: TIDAL BASIN
.5 MI E JCT I-95, Rockingham, NH
Built 1971 Load: 25.7 t ADT: 8,968
WADLEIGH HILL ROAD
FairOver: KEZAR LAKE OUTLET
0.17MI NH 114, Merrimack, NH
Built 1940 Load: 25.8 t ADT: 359
NH107
FairOver: LAMPREY RIVER
.4 MI S JCT RT 101, Rockingham, NH
Built 1962 Load: 25.8 t ADT: 13,430
NH 33
FairOver: CSX
.8 MI JCT I-95, Rockingham, NH
Built 1971 Load: 25.9 t ADT: 13,782
MADBURY ROAD
FairOver: CSX
.2 MI JCT RTE 4, Strafford, NH
Built 1980 Load: 25.9 t ADT: 4,618
MOUNTAIN ROAD
FairOver: ASHUELOT RIVER
0.45 MI. TL WASHINGTON, Sullivan, NH
Built 1936 Load: 25.9 t ADT: 1,214
NH116
FairOver: HAM BRANCH
2.01 MI S FRANCONIA T.L., Grafton, NH
Built 1932 Load: 26.1 t ADT: 404
MESSER STREET
FairOver: WINNIPESAUKEE RIVER
1.0 MI. JCT 106, Belknap, NH
Built 1980 Load: 26.3 t ADT: 5,460
CLIFFORD BROOK RD
FairOver: CLIFFORD BROOK
0.6 MI. JCT FISH HATCH RD, Grafton, NH
Built 1983 Load: 26.3 t ADT: 90
SAW MILL ROAD
FairOver: BEARDS BROOK
1.4 MI. RTE. 9, Hillsborough, NH
Built 1919 Load: 26.3 t ADT: 583
BROOK ROAD
FairOver: JACOBS BROOK
210 FT. RTE. 25A, Grafton, NH
Built 1930 Load: 26.4 t ADT: 52
Showing 651-700 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 |