State profile · Near median Poor share

New Hampshire bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in New Hampshire.

2,542
Public bridges
51.6%
Good condition
7.5%
Poor condition

New Hampshire holds 2,542 public highway bridges (#44 of 52 by inventory) with a 7.51% Poor share (#18 of 52 by Poor share).

That is 7.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 35 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

51.6%

1,312 bridges rated 7-9

1.6pp vs 50% benchmark

Poor Condition

7.5%

191 bridges whose lowest applicable component is rated 0-4

-0.0pp vs national avg 7.5%

New Hampshire vs national bridge condition

New Hampshire - Good condition share 51.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire - Poor-condition share 25.0%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

New Hampshire in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

New Hampshire vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

2,542 44th of 54 higher than 10 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for New Hampshire

The highlighted point is New Hampshire: 2,542 bridges and 7.51% in Poor condition, rank #35 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below New Hampshire on that same Poor-share ordering:

  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor
  • Oklahoma: 22,917 bridges · 7.70% Poor
  • Alaska: 1,685 bridges · 7.89% Poor

The full national sortable table lives on the rankings page.

Material families in New Hampshire

Exclusive FHWA material families across all 2,542 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains New Hampshire’s inventory

State agency holds 58.0% of the 2,542 public highway bridges filed under New Hampshire in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When New Hampshire’s bridges were built

Pre-1950 construction accounts for 26.2% of the 2,542 bridges with a recorded original year in New Hampshire. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

New Hampshire51.6%40.9%GoodFairPoor
Bridge inventory deck-condition mix - New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below New Hampshire on the same metric.

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548
Selected

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.70% top marginal rate
Structure
Progressive
Burden @ $100K
$22,917

AK

Alaska

7.89% top marginal rate
Structure
Progressive
Burden @ $100K
$1,685

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 Load: 0.0 t ADT: 388

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 Load: 0.0 t ADT: 404

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 Load: 0.0 t ADT: 90

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 Load: 0.0 t ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 Load: 0.0 t ADT: 90

All Bridges in New Hampshire

NH 16B

Fair

Over: WILDCAT BROOK

2.2 MI JCT 16A, Carroll, NH

Built 1964 Load: 26.5 t ADT: 151

GILMORE POND ROAD

Fair

Over: MOUNTAIN BROOK

0.6 MI FROM NH RTE 124, Cheshire, NH

Built 1920 Load: 26.5 t ADT: 619

PIPER POND RD

Fair

Over: BROOK

TOWN RD, Merrimack, NH

Built 1983 Load: 26.5 t ADT: 90

EASTERN DIST ROAD

Fair

Over: SMITH RIVER

.07 MI FR SUNAPEE LAKE R, Merrimack, NH

Built 1949 Load: 26.6 t ADT: 139

NH101

Fair

Over: US 1 NB

2.3 MI. FROM JCT. I-95, Rockingham, NH

Built 1963 Load: 26.6 t ADT: 7,261

NH113A

Fair

Over: WHITEFACE RIVER

2.1 MI W TAMWORTH TL, Carroll, NH

Built 1941 Load: 26.6 t ADT: 250

OWEN ROAD

Fair

Over: BISHOP BROOK

0.3 MI FR BISHOP BROOK R, Coos, NH

Built 1915 Load: 26.6 t ADT: 90

FDR 15

Fair

Over: KEENAN BROOK

MAP 02, Coos, NH

Built 1964 Load: 26.6 t ADT: 99

NH140

Fair

Over: MERRYMEETING RIVER

3.1 MI FROM GILMANTON TL, Belknap, NH

Built 1940 Load: 26.8 t ADT: 2,433

NH 9

Fair

Over: MALLEGO BROOK

1.2MI FROM BARRINGTON TL, Strafford, NH

Built 1960 Load: 26.8 t ADT: 7,882

NH110

Fair

Over: UPPER AMMONOOSUC RIVER

0.9 MI FROM DUMMER TL, Coos, NH

Built 1970 Load: 26.8 t ADT: 1,603

US 3

Fair

Over: NHRR

0.6 MI FROM VERMONT SL, Coos, NH

Built 1970 Load: 26.8 t ADT: 2,906

NH 31

Fair

Over: SOUHEGAN RIVER

.3 MI FROM GREENVILLE TL, Hillsborough, NH

Built 1951 Load: 26.8 t ADT: 4,450

US 3 NH 25

Fair

Over: PEMIGEWASSET RIVER NHRR

BRIDGEWATER TL, Grafton, NH

Built 1937 Load: 26.9 t ADT: 2,614

WEST SIDE ROAD

Fair

Over: LUCY BROOK

0.7 MI BARTLETT TL, Carroll, NH

Built 1976 Load: 26.9 t ADT: 3,201

NH 16

Fair

Over: SACO RIVER

1.6MI ALBANY TL, Carroll, NH

Built 1945 Load: 26.9 t ADT: 12,067

CENTER HILL ROAD

Fair

Over: LITTLE SUNCOOK RIVER

200FT NH9, Merrimack, NH

Built 1978 Load: 26.9 t ADT: 90

GREAT HOLLOW ROAD

Fair

Over: MINK BROOK

.76 MI N LEBANON TL, Grafton, NH

Built 1901 Load: 26.9 t ADT: 2,125

NH114

Fair

Over: CONTOOCOOK RIVER

0.1 MI S OF JCT RTE 202, Merrimack, NH

Built 1939 Load: 26.9 t ADT: 4,676

BRIDGE STREET

Fair

Over: ANDROSCOGGIN RIVER

0.17 MI JCT RTE 16, Coos, NH

Built 1969 Load: 26.9 t ADT: 975

NH151

Fair

Over: I-95

1.1 MI JCT 101D, Rockingham, NH

Built 1975 Load: 26.9 t ADT: 3,756

NH113A

Fair

Over: WONALANCET RIVER

3.4 MI FROM SANDWICH TL, Carroll, NH

Built 1965 Load: 27.1 t ADT: 251

NH 28 BYPASS

Fair

Over: COHAS BROOK

4.45 MI S AUBURN TL., Rockingham, NH

Built 1937 Load: 27.2 t ADT: 7,113

NH 16A

Fair

Over: WILDCAT BROOK

.55 MI N. JCT 16, Carroll, NH

Built 1931 Load: 27.2 t ADT: 1,482

NH 16

Fair

Over: ELLIS RIVER

1.5 MI JACKSON TL, Coos, NH

Built 1963 Load: 27.2 t ADT: 3,317

US 3

Fair

Over: BAGLEY BROOK

3.5 MI FROM CAMPTON TL, Grafton, NH

Built 1933 Load: 27.2 t ADT: 1,272

NH118

Fair

Over: LOST RIVER

0.1 MI W OF JCT RTE 112, Grafton, NH

Built 1941 Load: 27.2 t ADT: 504

US 3

Fair

Over: WEST BRANCH BROOK

0.6 MI FROM THORNTON TL, Grafton, NH

Built 1927 Load: 27.3 t ADT: 1,117

NH 43

Fair

Over: NORTH BRANCH RIVER

.3 MI FROM RAYMOND TL, Rockingham, NH

Built 1961 Load: 27.3 t ADT: 5,527

NH 26

Fair

Over: MOHAWK RIVER

3.5 MI WEST DIXVILLE TL, Coos, NH

Built 1929 Load: 27.3 t ADT: 1,584

NH116

Fair

Over: HAM BRANCH

1.0 MI S. FRANCONIA T.L., Grafton, NH

Built 1933 Load: 27.3 t ADT: 824

US 3

Fair

Over: US 3A NH 25 WB

4.1 MI FROM RUMNEY TL, Grafton, NH

Built 1965 Load: 27.3 t ADT: 4,270

MILL BROOK ROAD

Fair

Over: MILL BROOK

3.3 MI S. JCT. 302, Grafton, NH

Built 1928 Load: 27.4 t ADT: 174

I-89 NB

Fair

Over: NH114

1.9MI NEW LONDON T.L., Merrimack, NH

Built 1967 Load: 27.4 t ADT: 9,260

WYMAN AVE

Fair

Over: PISCATAQUA RIV BACK CHNL

0.1 KM SOUTH OF SR 103, Rockingham, NH

Built 1941 Load: 27.5 t ADT: 4,000

WEBSTER GROVES RD

Fair

Over: COUNTRY POND OUTLET

KINGSTON TL, Rockingham, NH

Built 1980 Load: 27.6 t ADT: 10

NH 25C

Fair

Over: EASTMAN BROOK

4.11 MI. NW OF WARREN TL, Grafton, NH

Built 1949 Load: 27.6 t ADT: 442

MARKET STREET EB

Fair

Over: TIDAL BASIN

.5 MI E JCT I-95, Rockingham, NH

Built 1971 Load: 27.6 t ADT: 8,968

TANNERY LANE

Fair

Over: TANNERY POND OUTLET

170 FT. FROM VILLAGE ROAD, Merrimack, NH

Built 1910 Load: 27.6 t ADT: 90

GREGG MILL ROAD

Fair

Over: S BR PISCATAQUOG RIVER

164 FT FR RIVER ROAD, Hillsborough, NH

Built 1938 Load: 27.7 t ADT: 606

TOWN FOREST ROAD

Fair

Over: COCKERMOUTH RIVER

0.1 MI FROM GROTON ROAD, Grafton, NH

Built 2007 Load: 27.8 t ADT: 50

I-93 RAMP

Fair

Over: FEE TPK

AT JCT. WITH FEET., Merrimack, NH

Built 1976 Load: 27.8 t ADT: 744

NORTH ROAD

Fair

Over: ANDROSCOGGIN RIVER

0.26 MI N US 2, Coos, NH

Built 1973 Load: 27.8 t ADT: 278

NH175

Fair

Over: PEMIGEWASSET RIVER

0.5 MI EAST JCT US 3, Grafton, NH

Built 1976 Load: 27.8 t ADT: 672

HANNAH NUTTER ROAD

Fair

Over: BIG RIVER

0.1 MI FR NEW ROCHESTER, Belknap, NH

Built 1940 Load: 27.9 t ADT: 90

US 4

Fair

Over: INDIAN RIVER

4.9 MILES FROM ENFIELD TL, Grafton, NH

Built 1978 Load: 27.9 t ADT: 5,839

PAYNE ROAD

Fair

Over: MASCOMA RIVER

.19 MI. FROM JCT. US 4, Grafton, NH

Built 1938 Load: 27.9 t ADT: 182

NH 25

Fair

Over: RED HILL RIVER

3.8 MI FROM CTR HARBOR TL, Carroll, NH

Built 1940 Load: 27.9 t ADT: 9,727

NH 63

Fair

Over: MILL BROOK

1.3 MI FROM JCT RTE 12, Cheshire, NH

Built 1930 Load: 27.9 t ADT: 1,029

NH113

Fair

Over: FORREST BROOK

1.9 MI NE TAMWORTH TL, Carroll, NH

Built 1955 Load: 28.0 t ADT: 2,751

Showing 351-400 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

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). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

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.

What to do with this

Use New Hampshire's inventory picture to drill to a county or a specific span.

  • Browse counties in New Hampshire and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. New Hampshire Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.