Total bridges
188
Public highway bridges in Coos County
County profile · official public datasets
Coos County, NH
188 public highway bridges tracked in the FHWA National Bridge Inventory: 49.5% rated Good, 44.1% Fair, 6.4% Poor.
- 188
- Public bridges
- 49.5%
- Good condition
- 6.4%
- Poor condition
The verdict
According to the Federal Highway Administration's 2024 National Bridge Inventory.
Coos County posts a better-than-median Poor-condition share among rated counties in the state across mid-size county bridge inventory.
- Top 40%
- lowest Poor share in state
- 6.4%
- Poor-condition share
- 188
- public highway bridges
- 1964
- 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.
Coos County Bridge Snapshot
According to the Federal Highway Administration's 2024 National Bridge Inventory, Coos County ranks #4 of 10 New Hampshire counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 6.4%). Coos County, New Hampshire contains 188 public highway bridges. Roughly 49.5% are rated “Good,” 44.1% “Fair,” and 6.4% “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.
Good condition
49.5%
93 of 188 rated 7-9
Fair condition
44.1%
83 of 188 rated 5-6
Poor condition
6.4%
12 of 188 rated 4 or below
In-state Poor-share rank
#4 of 10
Among New Hampshire counties with 5+ bridges, lower share ranks better
Condition distribution
Share of 188 NBI-tracked bridges by lowest applicable component rating.
Good 49.5% (93)
Fair 44.1% (83)
Poor 6.4% (12)
Coos County's Poor-condition bridges carry 5,976 vehicle crossings a day
That is 2.1% of the county's reported daily bridge traffic on 6.5% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 498 crossings a day against 1,515 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 185 of 188 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.
63.8% of Coos County's bridges have passed the 50-year mark
120 of the 188 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 49.5% 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 71.8% of the county's Poor-condition bridge traffic
US 2 over PEA BROOK, built 1932, carries 4,291 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 12-bridge count understates how much of the daily burden sits on a single crossing.
Share is of the 5,976 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.
When Coos County's bridges were built
188 bridges with a recorded construction year, grouped by decade
- pre-1900 4
Built before 1900
4 bridges
- 1900s 1
1900–1909
1 bridges
- 1910s 4
1910–1919
4 bridges
- 1920s 10
1920–1929
10 bridges
- 1930s
1930–1939
22 bridges
- 1940s
1940–1949
12 bridges
- 1950s
1950–1959
25 bridges
- 1960s
1960–1969
27 bridges
- 1970s
1970–1979
24 bridges
- 1980s
1980–1989
20 bridges
- 1990s
1990–1999
16 bridges
- 2000s
2000–2009
13 bridges
- 2010s 7
2010–2019
7 bridges
- 2020s 3
2020–2029
3 bridges
What this shows Construction peaked in the 1960s, when 27 of the county's bridges still in the inventory were built, which is 14.4% of those with a recorded year. That cohort is now 55 to 64 years old in the 2024 inventory. Its average build year (1964) matches the New Hampshire average (1968).
How Coos County compares with New Hampshire's closest counties by inventory size
The 5 New Hampshire counties nearest Coos County in number of bridges, with their condition splits. Its 6.4% Poor share is the 4th-lowest of these 6. Its average build year of 1964 against a peer-group mean of 1966 is in line with the group.
Showing the 5 closest of 9 New Hampshire counties eligible for comparison.
| County | Bridges | Good | Fair | Poor | Avg. built |
|---|---|---|---|---|---|
| Carroll County | 193 | 54.9% | 40.9% | 4.1% | 1966 |
| Cheshire County | 192 | 41.7% | 46.9% | 11.5% | 1960 |
| Coos County (this page) | 188 | 49.5% | 44.1% | 6.4% | 1964 |
| Sullivan County | 158 | 45.6% | 49.4% | 5.1% | 1963 |
| Strafford County | 136 | 63.2% | 27.9% | 8.8% | 1971 |
| Belknap County | 112 | 58% | 37.5% | 4.5% | 1969 |
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 Coos 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 Coos County, both outside New Hampshire so the neighborhoods are not the same-state size table above.
Similar inventory size
Nearest county inventories outside NH (188 bridges here).
- Pope County, AR · 188 bridges
- Kennebec County, ME · 188 bridges
- Socorro County, NM · 188 bridges
- Baker County, OR · 188 bridges
Similar average build year
Nearest mean year-built outside NH (1964 here).
- Bergen County, NJ · avg 1964 · 577 bridges
- Morris County, NJ · avg 1964 · 508 bridges
- Baltimore city County, MD · avg 1964 · 374 bridges
- Ross County, OH · avg 1964 · 356 bridges
Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.
Fair-condition bridges (83)
PLEASANT VALLEY RD
FairOver: OTTER BROOK
.7 MI FR LOST NATION #51, Coos, NH
Built 1980 Load: 35.4 t ADT: 90
NORTH ROAD
FairOver: LEADMINE BROOK
1.1 MI N JCT US 2, Coos, NH
Built 1960 Load: 35.5 t ADT: 90
NH 16
FairOver: MOOSE BROOK
3.8 MI BERLIN TL, Coos, NH
Built 1972 Load: 36.1 t ADT: 10,136
NH110
FairOver: ROARING BROOK
2.4 MI FROM STARK TL, Coos, NH
Built 1962 Load: 36.3 t ADT: 2,271
FRENCH ROAD
FairOver: JOHNS RIVER
2.9 MI NH 135, Coos, NH
Built 1948 Load: 36.4 t ADT: 207
MASON STREET
FairOver: CANAL
610FT WEST OF UNITY ST, Coos, NH
Built 1967 Load: 37.4 t ADT: 5,273
FDR 13
FairOver: UPPER AMMONOOSUC RIVER
MAP 02, Coos, NH
Built 1947 Load: 38.2 t ADT: 50
MASON STREET
FairOver: ANDROSCOGGIN RIVER
350FT WEST OF UNITY ST, Coos, NH
Built 1967 Load: 38.4 t ADT: 5,273
NH115A
FairOver: ISRAEL RIVER
2.4 MI SW JCT US 2, Coos, NH
Built 1973 Load: 38.7 t ADT: 819
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.7 MI S JEFFERSON TL, Coos, NH
Built 1934 Load: 40.8 t ADT: 90
VT105 BRIDGE ST
FairOver: CONNECTICUT RIVER
VERMONT STATE LINE, Coos, NH
Built 1947 Load: 40.8 t ADT: 1,113
US302
FairOver: AMMONOOSUC RIVER
4.46 MI E JCT US 3, Coos, NH
Built 1987 Load: 41.5 t ADT: 3,804
GARLAND ROAD
FairOver: BUNNEL BROOK
0.5 MI FR MCGARY ROAD, Coos, NH
Built 1981 Load: 41.7 t ADT: 90
NH 16TRK 12TH ST
FairOver: ANDROSCOGGIN RIVER
12TH ST BERLIN, Coos, NH
Built 1975 Load: 42.5 t ADT: 3,317
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.3 MI S JEFFERSON TL, Coos, NH
Built 1939 Load: 42.5 t ADT: 90
FDR 12
FairOver: BLUE BROOK
MAP 14, Coos, NH
Built 1947 Load: 42.8 t ADT: 50
NH 16TRK UNITY ST
FairOver: ANDROSCOGGIN RIVER
120FT FROM RTE 16, Coos, NH
Built 1982 Load: 43.3 t ADT: 3,983
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.5 MI S JEFFERSON TL, Coos, NH
Built 1990 Load: 44.5 t ADT: 90
JEFFERSON NOTCH RD
FairOver: S BRANCH ISRAEL RIVER
1.1 M S JEFFERSON TL, Coos, NH
Built 1939 Load: 45.3 t ADT: 90
GUILDHALL ROAD
FairOver: CONNECTICUT RIVER
VERMONT STATE LINE, Coos, NH
Built 1984 Load: 45.3 t ADT: 807
BORDEAU ROAD
FairOver: STRATFORD BOG BROOK
3.1 MI. US3, Coos, NH
Built 1970 Load: 46.7 t ADT: 90
NH 16
FairOver: CLAY BROOK
0.7 MI NE MARTINS LOC., Coos, NH
Built 1932 Load: 46.9 t ADT: 5,025
US 3
FairOver: AMMONOOSUC RIVER
1.9 MI BETHLEHEM TL, Coos, NH
Built 1972 Load: 48.0 t ADT: 5,127
NH110
FairOver: NORTH BRANCH BROOK
0.8 MI FROM DUMMER TL, Coos, NH
Built 1954 Load: 48.8 t ADT: 1,676
WINTER STREET
FairOver: ROARING BROOK
0.3 MI E NH RTE 110, Coos, NH
Built 1956 Load: 50.0 t ADT: 579
US302
FairOver: CRAWFORD BROOK
2.4Mi E Harts Locat.T/L, Coos, NH
Built 1965 Load: 52.4 t ADT: 3,804
DURAND ROAD
FairOver: CARLTON BROOK
0.2 MI FROM US RTE2, Coos, NH
Built 2010 Load: 54.7 t ADT: 256
NH 16
FairOver: NINETEEN MILE BROOK
1.4MI PINKHAMS GRANT TL, Coos, NH
Built 1954 Load: 61.2 t ADT: 3,317
US 2
FairOver: SNYDER BROOK
5.1 MI FROM JEFFERSON TL, Coos, NH
Built 1966 Load: 70.8 t ADT: 5,144
NH 16
FairOver: PEABODY RIVER
2.3 MI JACKSON TL, Coos, NH
Built 1960 Load: 79.8 t ADT: 3,317
US 2
FairOver: COLD BROOK
4.5 MI FROM JEFFERSON TL, Coos, NH
Built 1966 Load: 88.9 t ADT: 5,144
MT CLINTON ROAD
FairOver: SOKOKIS BROOK
3.57 MI NE JCT 302, Coos, NH
Built 1934 Load: 89.8 t ADT: 101
US 2
FairOver: STAG HOLLOW BROOK
2.5 MI FROM RANDOLPH TL, Coos, NH
Built 1969 Load: 89.8 t ADT: 4,701
Read our methodology - how this data is sourced, computed, and verified.
Related
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.