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

HELL HOLLOW ROAD

Good

Over: BLOW-ME-DOWN BROOK

0.2 MI FROM CORNISH TL, Sullivan, NH

Built 1975 Load: 99.9 t ADT: 131

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

TOWNHOUSE ROAD

Poor

Over: NORTHEAST POND

NH-ME SL, Strafford, NH

Built 1948 Load: 0.0 t ADT: 554

DOUGHERTY LANE

Poor

Over: MID BR PISCATAQUOG RIVER

0.8 MI FR SANDERS HILL R, Hillsborough, NH

Built 2004 Load: 0.0 t ADT: 90

PARADISE ROAD

Poor

Over: SUGAR RIVER

380 FT. RTE.11, Sullivan, NH

Built 1976 Load: 0.0 t ADT: 90

HIGH BRIDGE ROAD

Poor

Over: ARCHERTOWN BROOK

150FT W TILLOTSON RD JCT, Grafton, NH

Built 1940 Load: 0.0 t ADT: 90

WHIPPLE HILL ROAD

Poor

Over: ROARING BROOK

0.5 MI. RTE.119, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 331

CHRISTIAN HILL RD

Poor

Over: NHRR(ABD)

50 FT FROM SOUTH GROVE S, Cheshire, NH

Built 1930 Load: 0.0 t ADT: 2,159

MAPLE STREET

Poor

Over: BRANCH RIVER

0.02MI. RTE 153, Carroll, NH

Built 1940 Load: 0.0 t ADT: 90

BRIDGE STREET

Poor

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Cheshire, NH

Built 1930 Load: 0.0 t ADT: 6,100

OLD DEERFIELD ROAD

Poor

Over: BROOK

185 FT FROM NH RTE 43, Rockingham, NH

Built 1920 Load: 1.8 t ADT: 190

TEMPLETON TURNPIKE

Poor

Over: PRIEST BROOK

1.9MI. RTE 119, Cheshire, NH

Built 1984 Load: 2.7 t ADT: 86

DUDLEY ROAD

Poor

Over: LAMPREY RIVER

.23 MI JCT 101, Rockingham, NH

Built 1914 Load: 2.9 t ADT: 535

SHOP ROAD

Poor

Over: NEEDLE SHOP BROOK

0.8 MI N NEW CHESTER RD, Merrimack, NH

Built 1930 Load: 3.3 t ADT: 63

RIVER ROAD

Poor

Over: MAD RIVER

0.63MI. RTE 111, Strafford, NH

Built 1986 Load: 3.6 t ADT: 108

WHITCOMB MILLS RD

Poor

Over: WHITE BROOK

0.06 MI FR ARCH ST, Cheshire, NH

Built 1940 Load: 3.6 t ADT: 814

LEIGHTON MEADOW RD

Poor

Over: PHILLIPS BROOK

100 FT FR SULLIVAN RD 61, Coos, NH

Built 1940 Load: 3.6 t ADT: 90

JOHNSON HILL ROAD

Poor

Over: WEST BRANCH BROOK

1.5 MI MARSHALL HILL RD, Merrimack, NH

Built 1950 Load: 5.4 t ADT: 90

OAK STREET

Poor

Over: CSX

DOVER-ROLLINSFORD TL, Strafford, NH

Built 1890 Load: 5.4 t ADT: 8,552

PUTNAM ROAD

Poor

Over: BROOK

TOWN RD, Hillsborough, NH

Built 1930 Load: 5.8 t ADT: 90

NO DATA ENTERED

Poor

Over: NO DATA ENTERED

NO DATA ENTERED, Carroll, NH

Built 1990 Load: 5.8 t ADT: 10

GLEASON FALLS ROAD

Poor

Over: BEARDS BROOK

2.6 MILE FR NH RTE 9, Hillsborough, NH

Built 1900 Load: 5.9 t ADT: 90

JONES ROAD

Poor

Over: BEARDS BROOK

1.3 MI FR NH RTE 31, Hillsborough, NH

Built 1900 Load: 6.1 t ADT: 90

ON-ORBIT DRIVE

Poor

Over: GARDNER-JOE ENGLISH STRE

1.2 MILES FROM MAIN GATE., Hillsborough, NH

Built 1959 Load: 6.3 t ADT: 10

CENTENARY AVENUE

Poor

Over: NHRR

TOWN RD, Belknap, NH

Built 1940 Load: 8.0 t ADT: 90

CHICKWOLNEPY ROAD

Poor

Over: CHICKWOLNEPY STREAM

1.2 M FR E. SIDE RIVER RD, Coos, NH

Built 1950 Load: 8.0 t ADT: 90

RIVER ROAD

Poor

Over: PISCATAQUOG RIVER

0.5 MI FROM NH 77, Hillsborough, NH

Built 1940 Load: 8.2 t ADT: 1,824

MURPHY DAM ROAD

Poor

Over: DAM SPILLWAY

0.2 MI FROM US RT 3, Coos, NH

Built 1938 Load: 9.5 t ADT: 90

TEMPLE ROAD

Poor

Over: BLOOD BROOK

0.02 MI SW JCT NH101, Hillsborough, NH

Built 1901 Load: 9.8 t ADT: 1,214

CATE STREET

Poor

Over: HODGSON BROOK

.2 WEST OF BARTLETT St., Rockingham, NH

Built 1940 Load: 10.0 t ADT: 1,340

CRESSY HILL ROAD

Poor

Over: RAND BROOK

0.4MI. LYNDEBORO TL, Hillsborough, NH

Built 1940 Load: 10.4 t ADT: 90

WALKER BROOK ROAD

Poor

Over: FRAZIER BROOK

0.5 MI FR WILMOT T/L, Merrimack, NH

Built 1950 Load: 11.2 t ADT: 74

CORNISH TOLL BR RD

Poor

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Sullivan, NH

Built 1866 Load: 11.8 t ADT: 2,682

GRIFFIN MILL ROAD

Poor

Over: MAPLE FALLS BROOK

300 YDS N. OF NH 121, Rockingham, NH

Built 1850 Load: 12.4 t ADT: 187

POND ROAD

Poor

Over: CSX

0.6 MI. KINGSTON TL, Rockingham, NH

Built 1920 Load: 12.6 t ADT: 470

NH175

Poor

Over: PEMIGEWASSET RIVER

0.05 MI FROM JCT RTE 3, Grafton, NH

Built 1939 Load: 12.6 t ADT: 664

CRANE HILL ROAD

Poor

Over: GALE RIVER

TOWN RD, Grafton, NH

Built 1928 Load: 13.4 t ADT: 90

NH 16A

Poor

Over: E BR SACO RIVER

1.9 MI CONWAY TL, Carroll, NH

Built 1928 Load: 13.7 t ADT: 1,041

LEAVITT HILL ROAD

Poor

Over: BLOW-ME-DOWN-BROOK

1.4 MI FR CORBIN PARK, Sullivan, NH

Built 1950 Load: 13.7 t ADT: 110

LAFAYETTE ROAD

Poor

Over: HAM BRANCH

0.12MI. RTE 116, Grafton, NH

Built 1920 Load: 13.7 t ADT: 574

BRIDGE STREET

Poor

Over: NECRR

100 FT FROM NH RTE 12, Sullivan, NH

Built 1992 Load: 14.3 t ADT: 759

CLOTHESPIN BR ROAD

Poor

Over: BLACKWATER RIVER

0.88MI NH127, Merrimack, NH

Built 1954 Load: 14.5 t ADT: 448

NH127

Poor

Over: WARNER RIVER

.5 MI WEBSTER T.L., Merrimack, NH

Built 1937 Load: 14.9 t ADT: 1,550

NH 12A

Poor

Over: SUGAR RIVER

.1 MI. FROM JCT. RTE. 103, Sullivan, NH

Built 1967 Load: 15.1 t ADT: 1,051

DELTA DRIVE

Poor

Over: I-93 US 4

.6 MI NORTH OF JCT. US 4, Merrimack, NH

Built 1958 Load: 15.1 t ADT: 465

Showing 2,351-2,400 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.