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Scour Critical Bridges in New Hampshire

86 bridges in New Hampshire at risk from water erosion around foundations.

Scour Critical Bridges

Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 86 bridges in New Hampshire have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
CONNECTICUT RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1947 1,124
BLOODS BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1952 1,089
SUGAR RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1967 1,067
BRACKETT BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1929 826
CONTOOCOOK RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1933 712
MASCOMA RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1930 663
PEMIGEWASSET R CLARKS RR New Hampshire Scour Critical — Countermeasures Installed Good 1973 554
COLD RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1958 544
CONNECTICUT RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1930 500
SUNCOOK RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1981 453
PEABODY RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1950 441
SUNCOOK RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1948 427
MAD RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1968 415
COLD RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1964 369
REEL BROOK New Hampshire Scour Critical — Countermeasures Installed Good 1928 360
SWIFT RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1956 356
ASHUELOT RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1978 317
PATTEN BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1950 289
ROARING BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1950 233
SMITH RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1949 142
NEWFOUND RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1949 103
MELVIN RIVER New Hampshire Scour Critical — Countermeasures Installed Good 1936 98
COLD RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1930 96
AMMONOOSUC R NHRR(ABD) New Hampshire Scour Critical — Countermeasures Installed Fair 1832 96
NORTH BRANCH RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1991 96
BEEBE RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1877 96
WHITNEY BROOK New Hampshire Scour Critical — Countermeasures Installed Good 1988 96
SOUTH RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1920 96
BEARDS BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1900 96
ASHUELOT RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1960 96
GRIDLEY RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1927 95
ASHUELOT RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1920 65
CLEMENT BROOK New Hampshire Scour Critical — Countermeasures Installed Poor 1929 44
ASHUELOT RIVER New Hampshire Scour Critical — Countermeasures Installed Poor 1947 25
ASHUELOT RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1945 24
ANDROSCOGGIN RIVER New Hampshire Scour Critical — Countermeasures Installed Fair 1951 —

Scour Critical Rating Codes

Code 2 — UnaddressedBridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures InstalledProtective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures IneffectiveProtective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action.

About Scour Critical Bridges

Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.

All Bridges Poor Condition Historic Bridges Bridge Stats