County profile · official public datasets

Carroll County, NH

193 public highway bridges tracked in the FHWA National Bridge Inventory: 54.9% rated Good, 40.9% Fair, 4.1% Poor.

193
Public bridges
54.9%
Good condition
4.1%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Carroll County posts a top-10% lowest Poor-condition share among rated counties in the state across mid-size county bridge inventory.

Top 10%
lowest Poor share in state
4.1%
Poor-condition share
193
public highway bridges
1966
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Carroll County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Carroll County ranks #1 of 10 New Hampshire counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 4.1%). Carroll County, New Hampshire contains 193 public highway bridges. Roughly 54.9% are rated “Good,” 40.9% “Fair,” and 4.1% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

193

Public highway bridges in Carroll County

Good condition

54.9%

106 of 193 rated 7-9

Fair condition

40.9%

79 of 193 rated 5-6

Poor condition

4.1%

8 of 193 rated 4 or below

In-state Poor-share rank

#1 of 10

Among New Hampshire counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 193 NBI-tracked bridges by lowest applicable component rating.

Good
54.9% (106)
Fair
40.9% (79)
Poor
4.1% (8)

Carroll County's Poor-condition bridges carry 1,529 vehicle crossings a day

That is 0.3% of the county's reported daily bridge traffic on 4.1% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 191 crossings a day against 2,633 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 193 of 193 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

57.5% of Carroll County's bridges have passed the 50-year mark

111 of the 193 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 54.9% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 68.1% of the county's Poor-condition bridge traffic

NH 16A over E BR SACO RIVER, built 1928, carries 1,041 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 8-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 1,529 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

When Carroll County's bridges were built

193 bridges with a recorded construction year, grouped by decade

bridges

What this shows Construction peaked in the 1970s, when 28 of the county's bridges still in the inventory were built, which is 14.5% of those with a recorded year. That cohort is now 45 to 54 years old in the 2024 inventory. Its average build year (1966) matches the New Hampshire average (1968).

Source FHWA National Bridge Inventory (year built) As of 2024 NBI release

How Carroll County compares with New Hampshire's closest counties by inventory size

The 5 New Hampshire counties nearest Carroll County in number of bridges, with their condition splits. Its 4.1% Poor share is the 1st-lowest of these 6. Its average build year of 1966 against a peer-group mean of 1965 is in line with the group.

Showing the 5 closest of 9 New Hampshire counties eligible for comparison.

Bridge inventory size and condition shares for Carroll County and the 5 New Hampshire counties closest to it in inventory size
County Bridges Poor
Carroll County (this page) 193 4.1%
Cheshire County 192 11.5%
Coos County 188 6.4%
Sullivan County 158 5.1%
Strafford County 136 8.8%
Belknap County 112 4.5%

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Carroll County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Carroll County, both outside New Hampshire so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside NH (193 bridges here).

Similar average build year

Nearest mean year-built outside NH (1966 here).

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 193 Good 106 Fair 79 Poor 8

Good-condition bridges (106)

US302

Good

Over: NHRR(CONWAY SCENIC LINE)

2.1 MI SW JCT NH 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

US302

Good

Over: SACO RIVER

1.7 MI SW OF RTE 16, Carroll, NH

Built 2008 Load: 40.8 t ADT: 5,300

GRANITE ROAD

Good

Over: PINE RIVER

0.5 MI E JCT RTE 16, Carroll, NH

Built 2004 Load: 40.8 t ADT: 90

US302

Good

Over: SAWYER RIVER

1.8 MI FROM BARTLETT TL, Carroll, NH

Built 2013 Load: 41.5 t ADT: 2,768

FDR 34

Good

Over: WHITEFACE BROOK

MAP 32, Carroll, NH

Built 2005 Load: 41.5 t ADT: 50

NH112 KANCAMAGUS

Good

Over: OLIVERIAN BROOK

1.7 MI FROM WATERVILLE, Carroll, NH

Built 1963 Load: 41.7 t ADT: 3,016

NH113

Good

Over: MILL BROOK

0.5 MI FROM NH 25, Carroll, NH

Built 1987 Load: 42.0 t ADT: 2,216

NH113

Good

Over: BEARCAMP RIVER

2.6 MI FROM RTE 109, Carroll, NH

Built 1927 Load: 42.1 t ADT: 705

POTTER ROAD

Good

Over: CONWAY LAKE INLET

1.2 MI. RTE 153, Carroll, NH

Built 2009 Load: 42.2 t ADT: 90

NH 16 NH 25

Good

Over: BEARCAMP RIVER

2.5 MI S TAMWORTH T/L, Carroll, NH

Built 2021 Load: 42.8 t ADT: 11,527

SNOW ROAD

Good

Over: SOUTH RIVER

0.13 MI. RT 153, Carroll, NH

Built 2021 Load: 42.9 t ADT: 155

WHITTEN NECK ROAD

Good

Over: CRESCENT LAKE INLET

0.19 Mi.Fr. NH 28, Carroll, NH

Built 2005 Load: 42.9 t ADT: 495

US302 NH 16

Good

Over: ARTIST FALLS BROOK

6.2 MI FROM ALBANY TL, Carroll, NH

Built 1900 Load: 43.1 t ADT: 15,384

NH 16B

Good

Over: BEECH RIVER

.3 MI JCT. 16, Carroll, NH

Built 1932 Load: 43.3 t ADT: 2,052

DAVIS CROSSING RD

Good

Over: ELA RIVER

1/4 MI. NORTH FROM RT. 11, Carroll, NH

Built 2010 Load: 43.5 t ADT: 90

STANTON FARM RD

Good

Over: RAZOR BROOK

0.2 MI FR COBB RD, Carroll, NH

Built 1991 Load: 43.6 t ADT: 90

OSSIPEE MT ROAD

Good

Over: HALFWAY BROOK

1.6 MI. SANDWICH TL, Carroll, NH

Built 1949 Load: 43.6 t ADT: 354

NH 28

Good

Over: CSX(ABD)

1.6 MI WOLFEBORO T.L., Carroll, NH

Built 1959 Load: 43.6 t ADT: 4,489

ROBERTS ROAD

Good

Over: SNOW BROOK

TOWN RD, Carroll, NH

Built 2016 Load: 44.5 t ADT: 90

LONG ISLAND ROAD

Good

Over: LAKE WINNIPESAUKEE

4.1 MI FROM HANSON RD, Carroll, NH

Built 1988 Load: 44.7 t ADT: 1,219

US302

Good

Over: AVALANCHE BROOK

3.5 MI CARROLL TL, Carroll, NH

Built 1960 Load: 44.9 t ADT: 2,100

WHITAKER LANE

Good

Over: KEARSARGE BROOK

.06 MI FR BARTLET RD, Carroll, NH

Built 2000 Load: 45.3 t ADT: 90

US302

Good

Over: ROCKY BRANCH RIVER

1.1 MI. FROM JCT. NH 16, Carroll, NH

Built 1990 Load: 45.4 t ADT: 6,003

NH 16

Good

Over: ELLIS RIVER

0.5 MI FROM BARTLETT TL, Carroll, NH

Built 1938 Load: 45.4 t ADT: 7,181

NH 25

Good

Over: BEARCAMP RIVER

0.6 MI. TAMWORTH T.L., Carroll, NH

Built 2005 Load: 47.4 t ADT: 4,151

POTTER ROAD

Good

Over: SNOW BROOK

320FT RTE 153, Carroll, NH

Built 2022 Load: 48.2 t ADT: 90

CLEVELAND HILL RD

Good

Over: MILL BROOK

0.10 MI FR SPAULDING RD5, Carroll, NH

Built 2009 Load: 48.2 t ADT: 171

BRIDGE STREET

Good

Over: BRANCH RIVER

0.27MI. RTE 153, Carroll, NH

Built 2001 Load: 49.3 t ADT: 154

NH109

Good

Over: MELVIN RIVER

6.5 MI FROM WOLFEBORO TL, Carroll, NH

Built 1921 Load: 49.9 t ADT: 2,119

GOVERNORS ROAD

Good

Over: CHURCHILL BROOK

0.2 MI S JCT 109, Carroll, NH

Built 1940 Load: 50.0 t ADT: 90

US302

Good

Over: ALBANY BROOK

1.0 MI FROM HARTS LOC. TL, Carroll, NH

Built 1928 Load: 50.2 t ADT: 2,719

US302

Good

Over: STONY BROOK

0.3 MI FROM BARTLETT TL, Carroll, NH

Built 1939 Load: 50.2 t ADT: 2,768

NH153

Good

Over: OSSIPEE RIVER

0.1 MI N JCT RTE 25, Carroll, NH

Built 1956 Load: 50.6 t ADT: 3,541

NH 16

Good

Over: ELLIS RIVER

0.7 MI FROM JACKSON TL, Carroll, NH

Built 1990 Load: 50.8 t ADT: 9,125

NH 16

Good

Over: NHNCRR

.88MI S. OSSIPEE T.L., Carroll, NH

Built 1956 Load: 51.8 t ADT: 7,764

NH 25

Good

Over: PINE RIVER

0.6 MI FROM OLD N.H. 16, Carroll, NH

Built 1963 Load: 52.4 t ADT: 6,071

US302 NH113

Good

Over: CONWAY LAKE OUTLET

2.6 MI. FRYBERG ME S/L, Carroll, NH

Built 2021 Load: 53.3 t ADT: 11,517

MILL HILL ROAD

Good

Over: DAN HOLE RIVER

146 FT FR DANA MERROW RD, Carroll, NH

Built 1940 Load: 53.3 t ADT: 22

NH109

Good

Over: SALMON FALLS RIVER

NH-ME STATE LINE, Carroll, NH

Built 1962 Load: 53.4 t ADT: 777

RIVER STREET

Good

Over: SACO RIVER OVERFLOW

0.50 M. FROM US302, Carroll, NH

Built 2015 Load: 54.5 t ADT: 444

TASKER HILL ROAD

Good

Over: PEQUAWKET POND

IN CONWAY VILLAGE, Carroll, NH

Built 2010 Load: 55.2 t ADT: 90

PADDY ACRE ROAD

Good

Over: BROOK

0.14 MI FR MOULTONVILLE, Carroll, NH

Built 2017 Load: 56.0 t ADT: 90

NH112 KANCAMAGUS

Good

Over: HOBBS BROOK

3.3 MI FROM CONWAY TL, Carroll, NH

Built 1990 Load: 56.7 t ADT: 1,855

NH 16

Good

Over: PINE RIVER

2.8 MI FROM WAKEFIELD TL, Carroll, NH

Built 1976 Load: 57.2 t ADT: 7,426

US302

Good

Over: NANCY BROOK

8.3 MI CARROLL TL, Carroll, NH

Built 1978 Load: 57.8 t ADT: 2,768

NH109

Good

Over: SMITH RIVER

3.5 MI SE TUFTONBORO TL, Carroll, NH

Built 1900 Load: 59.1 t ADT: 7,249

MILL STREET

Good

Over: CONWAY LAKE OUTLET

0.8 MI FR US RTE 302, Carroll, NH

Built 1940 Load: 59.8 t ADT: 1,613

NH113A

Good

Over: SWIFT RIVER

4.5 MI FROM SANDWICH TL, Carroll, NH

Built 1956 Load: 60.0 t ADT: 351

NH 28 NH109

Good

Over: SMITH RIVER

3.5 MI FROM ALTON TL, Carroll, NH

Built 1935 Load: 66.3 t ADT: 8,679

PLEASANT VALLEY RD

Good

Over: HEATH BROOK

0.95 MILES FROM NH 28, Carroll, NH

Built 2020 Load: 68.4 t ADT: 1,017

Read our methodology - how this data is sourced, computed, and verified.

Related

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Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainBridges

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. This page draws directly on federal source data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.