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Scour-Critical Bridges in Connecticut

Connecticut has 276 bridges rated scour-critical by the Federal Highway Administration. These bridges have foundations that are unstable or at risk of undermining during flood events. Scour-critical doesn't mean a bridge is about to collapse — it means extra monitoring and countermeasures are in place — but these structures are priorities for repair or replacement.

How this ranking works

This state list filters to NBI scour ratings 0 through 3, then sorts by average daily traffic. It is intended to show flood-vulnerability exposure, not to label any bridge as currently unsafe.

BridgeCountyScour RatingDaily TrafficCondition
Interstate-95 over I-95 Rmp 047/five Mi RivFairfield3 — Serious136,600Fair
Interstate-91 NB over Mattabesset RiverMiddlesex3 — Serious99,500Fair
Route 15 over Rippowam RiverFairfield3 — Serious73,120Fair
Route 15 over Wepawaug RiverNew Haven3 — Serious68,300Fair
Route 15 over Converse Pond BrookFairfield3 — Serious53,800Fair
Interstate-84 over Roaring BrookTolland3 — Serious50,400Fair
Interstate-91 SB over Mattabesset RiverMiddlesex3 — Serious49,200Fair
Interstate-395 over Yantic River Nec RrNew London3 — Serious37,800Fair
Route 15 SB over Quinnipiac RiverNew Haven3 — Serious35,800Fair
Route 15 NB over Quinnipiac RiverNew Haven3 — Serious33,700Poor
US RTE 44 & RTE 10 over Farmington RiverHartford3 — Serious26,100Fair
Route 63 over West RiverNew Haven3 — Serious23,100Fair
U.s. Route 1 over Five Mile RiverFairfield3 — Serious21,900Fair
Route 68 over Quinnipiac RiverNew Haven3 — Serious19,400Fair
Route 2 over Yantic RiverNew London3 — Serious19,000Fair
US Route 7 over Norwalk RiverFairfield3 — Serious18,800Fair
US Route 44 RTE 1 over Still RiverLitchfield3 — Serious18,500Poor
US Route 1 over West RiverFairfield3 — Serious17,600Poor
Route 67 over Little RiverNew Haven3 — Serious17,200Fair
Route 108 over Means BrookFairfield3 — Serious16,400Fair
US RTE 1 W Broad S over Pawcatuck RiverNew London3 — Serious16,400Poor
Route 80 over Branford RiverNew Haven3 — Serious16,300Fair
West Street over Still RiverFairfield3 — Serious16,000Fair
North Main Street over West Branch Trout BrookHartford3 — Serious15,660Fair
Route 67 over Little RiverNew Haven3 — Serious14,800Fair
Route 67 over Little RiverNew Haven3 — Serious14,600Fair
West Broad Street over Rippowam RiverFairfield3 — Serious14,220Poor
Route 37 over Boggs Pond BrookFairfield3 — Serious13,740Fair
Route 67 over Little RiverNew Haven3 — Serious13,700Fair
Route 67 over Little RiverNew Haven3 — Serious13,700Fair
Route 22 over Farm RiverNew Haven3 — Serious12,200Fair
Adams Street over Hockanum RiverHartford3 — Serious12,100Good
US Route 1 over Stoney BrookFairfield3 — Serious11,800Good
Route 67 over Eight Mile BrookNew Haven3 — Serious11,800Fair
Route 171 over Saw Mill BrookWindham3 — Serious11,800Fair
Eagle Road over Still RiverFairfield3 — Serious11,320Fair
Route 34 over Four Mile BrookNew Haven3 — Serious11,100Fair
US Route 1 over Mystic RiverNew London3 — Serious11,000Fair
U.s. Route 202 over Nepaug RiverLitchfield3 — Serious10,800Fair
Route 22 over Muddy RiverNew Haven3 — Serious10,800Fair
Route 69 over Mad RiverNew Haven3 — Serious10,400Fair
Crosby Street over Padanaram BrookFairfield3 — Serious10,334Fair
Route 313 over Naugatuck RiverNew Haven3 — Serious9,900Fair
Route 179 over Burlington BrookHartford3 — Serious9,800Fair
Route 372 over Mattabesset RiverHartford3 — Serious9,700Fair
SR 712 (bridge St) over Housatonic RiverFairfield3 — Serious9,500Fair
Route 82 over Connecticut RiverMiddlesex3 — Serious9,100Poor
Route 67 over Little RiverNew Haven3 — Serious9,100Fair
Route 67 over Little RiverNew Haven3 — Serious9,100Fair
Route 101 over Quinebaug RiverWindham3 — Serious9,100Fair
Route 63 over Beacon Hill BrookNew Haven3 — Serious8,900Fair
Brookside Drive over Mill RiverFairfield3 — Serious8,800Fair
U.s. Route 6 over Nonewaug RiverLitchfield3 — Serious8,700Fair
Camp Avenue over Noroton RiverFairfield3 — Serious8,650Fair
Route 101 over Mashamoquet BrookWindham3 — Serious8,500Fair
U.s. Route 44 over Skungamaug RiverTolland3 — Serious8,300Fair
Meadow Road over Pequabuck RiverHartford3 — Serious8,240Fair
Route 12 over Pachaug River - P & W RrNew London3 — Serious8,200Fair
East Aurora Street over Steele BrookNew Haven3 — Serious7,900Fair
East Albert Street over Naugatuck RiverLitchfield3 — Serious7,800Poor
Route 63 over Beacon Hill BrookNew Haven3 — Serious7,700Good
US Route 1 over Neck RiverNew Haven3 — Serious7,500Fair
Cold Spring Road over Rippowam RiverFairfield3 — Serious7,470Fair
Route 190 over Edson BrookTolland3 — Serious7,400Good
U.s. Route 202 over East Aspetuck RiverLitchfield3 — Serious7,300Fair
SR 847 over Mad RiverNew Haven3 — Serious7,300Fair
Route 114 over Wepawaug RiverNew Haven3 — Serious7,200Good
Route 80 over West RiverNew Haven3 — Serious7,100Fair
Fern Street over West Branch Trout BrookHartford3 — Serious7,000Poor
Blake Street over Wintergreen BrookNew Haven3 — Serious7,000Fair
Floydville Road over Salmon BrookHartford3 — Serious6,730Fair
Congress Street #2 over Mill RiverFairfield3 — Serious6,505Poor
US Route 44 & RTE over Indian Meadow BrookLitchfield3 — Serious6,200Fair
Route 138 over Denison BrookNew London3 — Serious6,200Fair
Center Street over Harbor BrookNew Haven3 — Serious6,186Poor
Route 179 over Neds BrookHartford3 — Serious6,100Fair
Washington Ave. #3 over Mad RiverNew Haven3 — Serious6,000Fair
Ssr 453 over Mill RiverNew Haven3 — Serious5,900Fair
Route 83 over Roaring BrookHartford3 — Serious5,700Fair
Route 80 over Rogers PondMiddlesex3 — Serious5,700Fair
Hamden Hills Drive over Shepard Brook & Rr TrailNew Haven3 — Serious5,690Fair
Stillman Avenue over Pawcatuck RiverNew London3 — Serious5,562Fair
Route 10 over Ten Mile RiverHartford3 — Serious5,500Fair
Route 100(main St) over Farm RiverNew Haven3 — Serious5,500Fair
US Route 44 over Whiting RiverLitchfield3 — Serious5,400Fair
Route 318 over Morgan BrookLitchfield3 — Serious5,400Fair
Route 49 over Shunock RiverNew London3 — Serious5,200Fair
West Cedar Street over Five Mile RiverFairfield3 — Serious5,120Poor
Jerome Avenue over Copper Mine BrookHartford3 — Serious5,054Fair
Oregon Road over Quinnipiac RiverNew Haven3 — Serious4,900Poor
Route 80 over Chatfield Hollow BrookMiddlesex3 — Serious4,800Fair
US Route 44 over Fenton RiverTolland3 — Serious4,700Fair
U.s. Route 6 over Nonewaug RiverLitchfield3 — Serious4,500Fair
US Route 44 over Knowlton BrookWindham3 — Serious4,400Fair
June Road over Mianus RiverFairfield3 — Serious4,390Fair
South Park Avenue over Mill RiverFairfield3 — Serious4,386Fair
US Route 44 over Spruce Swamp CreekLitchfield3 — Serious4,300Fair
Route 205 over Quinebaug River & CanalWindham3 — Serious4,300Fair
Ashland Street over Pachaug RiverNew London3 — Serious4,214Fair
Route 47 over Shepaug RiverLitchfield3 — Serious4,200Fair
Route 169 over Mashamoquet BrookWindham3 — Serious4,200Fair
Humphrey Street over Mill RiverNew Haven3 — Serious4,100Poor
Route 53 over W Branch Saugatuck RiverFairfield3 — Serious4,000Fair
Route 118 over Spruce BrookLitchfield3 — Serious4,000Fair
Route 67 over Second Hill BrookLitchfield3 — Serious3,900Fair
Old Kings Highway over Stony BrookFairfield3 — Serious3,820Poor
West Thompson Road over French RiverWindham3 — Serious3,800Fair
Portland Avenue over Norwalk RiverFairfield3 — Serious3,790Fair
Main Street over Pocotopaug CreekMiddlesex3 — Serious3,718Good
Naubuc Avenue over Porter BrookHartford3 — Serious3,600Fair
Greens Farms Road over Sasco BrookFairfield3 — Serious3,540Poor
Russell Street over Sumner BrookMiddlesex3 — Serious3,433Fair
E. Washington AVE over Pequonnock RiverFairfield3 — Serious3,343Fair
Nichols Road over Mad RiverNew Haven3 — Serious3,340Fair
Nichols Road over Mad RiverNew Haven3 — Serious3,340Fair
Housatonic Avenue over Aspetuck RiverLitchfield3 — Serious3,200Fair
Hulls Farm Road over Sasco BrookFairfield3 — Serious3,090Fair
Eagle Street over Naugatuck RiverNew Haven3 — Serious3,067Poor
Spring Hill Road over Pequonnock RiverFairfield3 — Serious3,000Fair
Wellers Bridge RD over Shepaug RiverLitchfield3 — Serious3,000Poor
Green Hill Road over Neck RiverNew Haven3 — Serious2,996Fair
Route 37 over Quaker BrookFairfield3 — Serious2,900Fair
Route 17 over Carr BrookMiddlesex3 — Serious2,900Fair
Connelly Parkway over Mill RiverNew Haven3 — Serious2,900Poor
River Road #1 over Sumner BrookMiddlesex3 — Serious2,892Poor
River Road over Hammonasset RiverNew Haven3 — Serious2,833Fair
Route 112 over Salmon CreekLitchfield3 — Serious2,800Fair
Wall Street over E Branch Naugatuck RiverLitchfield3 — Serious2,780Fair
Route 63 over West Br. Bantam RiverLitchfield3 — Serious2,700Fair
Route 156 over Eight Mile RiverNew London3 — Serious2,700Good
East Street over East Branch Salmon BrookHartford3 — Serious2,630Fair
Route 196 over Pocotopaug CreekMiddlesex3 — Serious2,600Fair
Beacon Valley Road over Beacon Hill BrookNew Haven3 — Serious2,600Good
Route 197 over Quinebaug RiverWindham3 — Serious2,600Fair
Route 189 over Belden BrookHartford3 — Serious2,500Fair
Route 4 over Guinea BrookLitchfield3 — Serious2,200Poor
Lambert Road over Race BrookNew Haven3 — Serious2,200Good
West Road over Blackledge RiverHartford3 — Serious2,100Fair
U.s. Route 7 over Gunn BrookLitchfield3 — Serious2,100Fair
Route 63 over Hollenbeck RiverLitchfield3 — Serious2,100Fair
Church Hill Road # over Aspetuck RiverFairfield3 — Serious2,070Fair
Old Road #2 over Sasco BrookFairfield3 — Serious2,030Poor
Topstone Road over Norwalk RiverFairfield3 — Serious2,010Fair
Route 20 over Still RiverLitchfield3 — Serious2,000Fair
Route 72 over Poland RiverLitchfield3 — Serious2,000Fair
Route 72 over Poland RiverLitchfield3 — Serious2,000Fair
Waite Street over Lake WhitneyNew Haven3 — Serious2,000Poor
Wells Road over East Branch Salmon BrookHartford3 — Serious1,985Fair
Morehouse HWY #1 over Mill RiverFairfield3 — Serious1,930Poor
Roseland Park Road over Muddy BrookWindham3 — Serious1,924Fair
Route 179 over Cherry BrookHartford3 — Serious1,900Good
King Hill Road over Indian Pond CreekLitchfield3 — Serious1,829Fair
Cannon Road over Norwalk RiverFairfield3 — Serious1,810Fair
Bristol Street #1 over Naugatuck RiverNew Haven3 — Serious1,800Fair
Watertown Road over Hop BrookNew Haven3 — Serious1,800Good
Route 132 over Weekeepeemee RiverLitchfield3 — Serious1,700Fair
Plains Road over Shetucket RiverWindham3 — Serious1,700Fair
Union Street over Deep RiverMiddlesex3 — Serious1,680Fair
Gurleyville Road over Fenton RiverTolland3 — Serious1,550Fair
Valley Road over Branford RiverNew Haven3 — Serious1,525Good
Depot Street over Naugatuck RiverNew Haven3 — Serious1,500Fair
Bolton Road over Tankerhoosen RiverTolland3 — Serious1,500Good
East Putnam Road over Cady BrookWindham3 — Serious1,398Fair
Four Bridges Road over Scantic RiverTolland3 — Serious1,300Fair
Buddington Road over Farmill RiverFairfield3 — Serious1,265Fair
Mason Road over Blackwell BrookWindham3 — Serious1,208Fair
South Main Street over Blackledge RiverHartford3 — Serious1,200Fair
Route 126 over Hollenbeck RiverLitchfield3 — Serious1,200Good
SR 608 over Yantic RiverNew London3 — Serious1,200Fair
New Road over Mill RiverNew Haven3 — Serious1,125Fair
Route 39 over Wimisink BrookFairfield3 — Serious1,100Fair
Route 128 over Housatonic RiverLitchfield3 — Serious1,100Fair
Route 183 over Sandy BrookLitchfield3 — Serious1,100Fair
South Leonard ST over Naugatuck RiverNew Haven3 — Serious1,100Fair
Chestnut Hill Road over Five Mile RiverWindham3 — Serious1,019Fair
Brock Street over Pequonnock RiverFairfield3 — Serious1,009Good
Hellstrom Road over Farm RiverNew Haven3 — Serious1,004Fair
SR 608 over Yantic RiverNew London3 — Serious1,000Fair
Newtown Turnpike over West Branch SaugatuckFairfield3 — Serious950Fair
Brook Road #2 over Merrick BrookWindham3 — Serious945Good
Spring Street over Middle RiverTolland3 — Serious914Fair
Wheaton Road over East Aspetuck RiverLitchfield3 — Serious908Poor
South Street over Little Jacks BrookLitchfield3 — Serious898Fair
Poverty Hollow RD over Aspetuck RiverFairfield3 — Serious885Fair
Brooksvale Avenue over Jepp BrookNew Haven3 — Serious850Good
Darling Road over Eight Mile RiverNew London3 — Serious836Fair
Old Colony Road over Bungee BrookWindham3 — Serious750Fair
East Street over Mill BrookHartford3 — Serious700Fair
Wild Horse Court over Sammis BrookFairfield3 — Serious673Good
Sharon Valley RD over Indian Pond CreekLitchfield3 — Serious670Fair
Morgan Brook Road over Morgan BrookLitchfield3 — Serious660Fair
King Road over Scantic RiverTolland3 — Serious654Fair
Quaddick Town Farm over Five Mile RiverWindham3 — Serious650Fair
South River RD #2 over Willimantic RiverTolland3 — Serious629Fair
Center Street over Middle RiverTolland3 — Serious600Fair
East Street South over Bantam RiverLitchfield3 — Serious585Fair
Stone Bridge Road over Little RiverWindham3 — Serious572Fair
Five Mile River RD over Five Mile RiverWindham3 — Serious550Fair
Mechanicsville RD over East Branch Salmon BrookHartford3 — Serious540Fair
Tufts Drive over Tucker BrookHartford3 — Serious530Good