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

All bridges (193)

RIVER STREET

Fair

Over: SACO RIVER

0.05 MI FR COBB RD, Carroll, NH

Built 1967 Load: 32.7 t ADT: 444

NH113B

Fair

Over: MCDONOUGH BROOK

7.27 MI N. CONWAY T.L., Carroll, NH

Built 1953 Load: 32.7 t ADT: 139

NH 16 NH113

Fair

Over: PEQUAWKET POND

1.2 MI FROM ALBANY TL, Carroll, NH

Built 1940 Load: 32.7 t ADT: 13,581

ELM STREET

Fair

Over: PINE RIVER

1.55 MI. OSSIPEE TL, Carroll, NH

Built 1983 Load: 32.7 t ADT: 1,011

NH 16

Fair

Over: NH 25

6.0 MI TAMWORTH T.L., Carroll, NH

Built 1969 Load: 32.7 t ADT: 7,962

MAIN STREET

Fair

Over: SWIFT RIVER

0.09 MI FROM NH RTE 113, Carroll, NH

Built 1973 Load: 32.7 t ADT: 800

FDR 400

Fair

Over: BEEBE RIVER

MAP 45, Carroll, NH

Built 1982 Load: 34.3 t ADT: 50

RIVER ROAD

Fair

Over: LOVEJOY BROOK

1.6 MI FROM BARTLETT TL, Carroll, NH

Built 1961 Load: 34.5 t ADT: 4,565

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.4 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

SANDWICH NOTCH RD

Fair

Over: BEARCAMP RIVER

5.1 MI FR THORNTON TL, Carroll, NH

Built 1983 Load: 34.5 t ADT: 90

NH 25 NH113

Fair

Over: COLD BROOK

1.9 MI FROM SANDWICH T.L., Carroll, NH

Built 1938 Load: 35.7 t ADT: 4,973

GILMAN VALLEY ROAD

Fair

Over: STONY BROOK

0.3 MI. OSSIPEE TL, Carroll, NH

Built 1930 Load: 36.3 t ADT: 90

US302

Fair

Over: SACO RIVER

2.4 MI E JCT 16, Carroll, NH

Built 1972 Load: 37.1 t ADT: 13,181

HUNTRESS BRIDGE RD

Fair

Over: OSSIPEE RIVER

FREEDOM TL, Carroll, NH

Built 1936 Load: 38.4 t ADT: 180

NH113

Fair

Over: CHANDLER BROOK

3.0 MI S OF MAINE SL, Carroll, NH

Built 1931 Load: 40.4 t ADT: 343

NH109

Fair

Over: SHANNON BROOK

3.3 MI FROM TUFTONBORO TL, Carroll, NH

Built 1929 Load: 41.2 t ADT: 3,457

BEAR NOTCH ROAD

Fair

Over: SWIFT RIVER

.35 MI NORTH JCT 112, Carroll, NH

Built 1961 Load: 41.5 t ADT: 975

NH113

Fair

Over: SWIFT RIVER

1.2 MI NE JCT NH 25, Carroll, NH

Built 1987 Load: 42.3 t ADT: 2,216

CHAPEL ROAD

Fair

Over: LOVELL RIVER

0.5 MI FR OSSIPEE RD, Carroll, NH

Built 1940 Load: 43.5 t ADT: 90

QUAKER WHITEFACE R

Fair

Over: WHITEFACE RIVER

0.45 MI. RTE. 113A, Carroll, NH

Built 1953 Load: 46.7 t ADT: 90

US302

Fair

Over: ELLIS RIVER

0.20mi west of jct. NH16, Carroll, NH

Built 1998 Load: 47.7 t ADT: 6,003

NH 16

Fair

Over: BRANCH RIVER

3.5MI FROM MILTON T.L., Carroll, NH

Built 1959 Load: 51.8 t ADT: 9,869

NH113

Fair

Over: CHOCORUA RIVER

5.1 MI NE JCT 25 & 113, Carroll, NH

Built 1925 Load: 54.5 t ADT: 2,127

US302

Fair

Over: SACO RIVER

4.4 MI CARROLL TL, Carroll, NH

Built 1949 Load: 57.6 t ADT: 2,100

NH 16

Fair

Over: PINE RIVER

2.4 MI FROM WAKEFIELD TL, Carroll, NH

Built 1930 Load: 58.1 t ADT: 7,426

US302

Fair

Over: WILLEY BROOK

1.3 MI SE FROM CARROLL TL, Carroll, NH

Built 1978 Load: 74.5 t ADT: 2,691

NH112

Fair

Over: DOWNES BROOK

0.1 MI FROM WATERVILLE, Carroll, NH

Built 1963 Load: 79.0 t ADT: 3,016

NH 25

Fair

Over: STONY BROOK

5.4 MI FROM OSSIPEE TL, Carroll, NH

Built 1986 Load: 89.8 t ADT: 3,737

US302

Fair

Over: BROOK

3.8 MI. FROM N.H. 16, Carroll, NH

Built 1961 Load: 99.9 t ADT: 5,300

NO DATA ENTERED

Good

Over: ALBANY BROOK

NO DATA ENTERED, Carroll, NH

Built 1998 ADT: 10

NO DATA ENTERED

Good

Over: TRIB TO LOUISVILLE BROOK

NO DATA ENTERED, Carroll, NH

Built 2023 ADT: 50

PASSACONAWAY ROAD

Good

Over: SWIFT RIVER

0.1 MI FR KANCAMAGUS HWY, Carroll, NH

Built 1858 Load: 5.9 t ADT: 308

NH113A

Good

Over: COLD RIVER

0.9 MI WING ROAD ROAD, Carroll, NH

Built 1935 Load: 11.1 t ADT: 480

BEARCAMP POND ROAD

Good

Over: BEARCAMP RIVER

0.5 MI FROM NH RTE 25, Carroll, NH

Built 1900 Load: 13.2 t ADT: 90

BRYANT ROAD

Good

Over: MILL BROOK

0.8 MI FROM NH ROUTE 113, Carroll, NH

Built 1940 Load: 14.5 t ADT: 90

BUNKER HILL ROAD

Good

Over: MILL BROOK

2.1 MI. RTE.113, Carroll, NH

Built 2020 Load: 19.1 t ADT: 90

SCOTT ROAD

Good

Over: CHOCORUA RIVER

0.17 MIMS NH RTE 16, Carroll, NH

Built 2023 Load: 20.0 t ADT: 90

RIVER ROAD

Good

Over: SACO RIVER OVERFLOW

2.0 MI FROM BARTLETT TL, Carroll, NH

Built 1955 Load: 20.9 t ADT: 4,565

NH153

Good

Over: BRANCH RIVER

3.1 MI N MILTON TL, Carroll, NH

Built 1932 Load: 22.7 t ADT: 3,739

SKIMOBILE ROAD

Good

Over: KEARSARGE BROOK

1.16 MI FR KEARSARGE ST, Carroll, NH

Built 1950 Load: 22.9 t ADT: 90

ANNIE NICHOLS ROAD

Good

Over: DAN HOLE RIVER

0.14 MI FR TUFTONBORO RD, Carroll, NH

Built 1994 Load: 24.5 t ADT: 90

NH113

Good

Over: BEARCAMP RIVER

0.9 MI E SANDWICH TL, Carroll, NH

Built 1972 Load: 27.8 t ADT: 764

NH 16

Good

Over: ELLIS RIVER

5.6 MI FROM BARTLETT TL, Carroll, NH

Built 1933 Load: 28.1 t ADT: 3,513

NH113A

Good

Over: WONALANCET RIVER

1.6 MI FROM SANDWICH TL, Carroll, NH

Built 1966 Load: 28.1 t ADT: 251

BEAR NOTCH ROAD

Good

Over: DOUGLAS BROOK

2.4 MI N. JCT 112, Carroll, NH

Built 1964 Load: 28.8 t ADT: 975

NH 25

Good

Over: OUTLET LOON POND

1.5 MI E NH-ME STATE LINE, Carroll, NH

Built 1941 Load: 29.0 t ADT: 3,402

NH113

Good

Over: BEARCAMP RIVER

JCT NH113/OLD NH 25, Carroll, NH

Built 2018 Load: 29.4 t ADT: 2,230

NH153

Good

Over: STONY BROOK

0.2 MI S MADISON TL, Carroll, NH

Built 1929 Load: 29.9 t ADT: 2,701

COUNTY ROAD

Good

Over: MELVIN RIVER

0.5 MI FROM NH RTE 109, Carroll, NH

Built 1936 Load: 30.7 t ADT: 97

COBB FARM ROAD

Good

Over: RAZOR BROOK

1.9 MI FR HARTS LOCATION, Carroll, NH

Built 1935 Load: 31.4 t ADT: 315

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.