Scour-Critical Bridges in Massachusetts

Massachusetts has 121 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.

Bridge	County	Scour Rating	Daily Traffic	Condition
I 93 over Water Merrimack River	Essex	3 — Serious	119,818	Poor
I 495 & Access Rps over Water Merrimack River	Essex	3 — Serious	79,000	Poor
I 495 NB over Water Merrimack River	Essex	3 — Serious	60,056	Poor
St110 /st38 over Water Merrimack River	Middlesex	3 — Serious	56,200	Fair
I 95 SB over Water Fish Brook	Essex	3 — Serious	43,600	Fair
I 95 NB over Water Fish Brook	Essex	3 — Serious	43,300	Fair
St125 Bridge ST over Water Merrimack River	Essex	3 — Serious	33,900	Poor
HWY Adams ST over Water Neponset River	Suffolk	3 — Serious	32,845	Fair
US 6 (west Brg) over Comb Acus Riv/loc St/rr	Bristol	3 — Serious	32,200	Fair
HWY Prospect ST over Water Charles River	Middlesex	3 — Serious	31,500	Fair
ST 28 Main ST over Water Martins Brook	Middlesex	3 — Serious	31,080	Fair
US 20 Park AVE over Water Connecticut River	Hampden	3 — Serious	27,500	Fair
Us202 St10/elm SB over Water Westfield River	Hampden	3 — Serious	27,300	Fair
HWY Aiken ST over Water Merrimack River	Middlesex	3 — Serious	26,000	Fair
HWY Amesbury ST over Comb Merimac Riv/access	Essex	3 — Serious	25,000	Fair
HWY Nepnst V Pky over Water Neponset River	Suffolk	3 — Serious	23,300	Fair
US 20 /us7/south over Water Housatonic River	Berkshire	3 — Serious	23,286	Fair
HWY Central AVE over Water Charles River	Norfolk	3 — Serious	22,500	Good
St147 Memorial AVE over Comb Amtrak & Conn Riv	Hampden	3 — Serious	21,706	Fair
HWY Bridge ST over Water Charles River	Middlesex	3 — Serious	21,500	Fair
ST 16 Washngton ST over Water Charles River	Middlesex	2 — Critical	20,800	Fair
HWY Bridge ST over Water Merrimack River	Middlesex	3 — Serious	18,230	Fair
HWY Washngton ST over Water Neponset River	Norfolk	3 — Serious	16,785	Fair
ST 12 Spring ST over Water Millers River	Worcester	3 — Serious	16,680	Fair
HWY Newton ST over Water Charles River	Middlesex	3 — Serious	16,601	Fair
St138 Weir ST over Water Mill River	Bristol	3 — Serious	16,422	Fair
ST 28 Montello ST over Water Salisbury Brook	Plymouth	3 — Serious	16,300	Good
HWY Onset AVE over Water East River	Plymouth	3 — Serious	15,000	Fair
ST 62 Main ST over Water Assabet River	Middlesex	3 — Serious	14,400	Fair
Us202 River ST over Water Millers River	Worcester	2 — Critical	14,094	Fair
St119 Great RD over Water Beaver Brook	Middlesex	3 — Serious	13,913	Fair
HWY Winthrop ST over Water Mystic River	Middlesex	3 — Serious	13,500	Poor
US 1 Newbrprt Tpk over Water Ipswich River	Essex	3 — Serious	13,394	Fair
HWY Lawrence ST over Water Concord River	Middlesex	2 — Critical	13,300	Fair
St131 Sndrsdale RD over Water Sandersdale Canal	Worcester	3 — Serious	13,189	Fair
US 44 Winthrop ST over Water Palmer River	Bristol	3 — Serious	13,010	Poor
ST 28 Broadway over Water Spicket River	Essex	3 — Serious	13,010	Fair
HWY Sudbury RD over Water Sudbury River	Middlesex	3 — Serious	13,000	Fair
ST 28 Broadway over Water Spicket River	Essex	3 — Serious	12,808	Poor
ST 12 Main ST over Water French River	Worcester	3 — Serious	12,630	Fair
ST 66 West ST over Water Mill River	Hampshire	3 — Serious	12,200	Fair
HWY Church ST over Water Blackstone River	Worcester	3 — Serious	12,200	Fair
HWY Webster ST over Water Leesville Pd Otlt	Worcester	3 — Serious	11,567	Fair
HWY Mt Vernon ST over Water Aberjona River	Middlesex	3 — Serious	10,600	Fair
ST 2 over Comb St112 & Deerfld R	Franklin	3 — Serious	10,562	Fair
ST 9 E Main ST over Water Coys Brook	Worcester	3 — Serious	10,500	Fair
HWY Centre ST over Water Charles River	Norfolk	3 — Serious	10,216	Fair
HWY Chestnut ST over Water Charles River	Norfolk	3 — Serious	10,100	Poor
HWY Elm ST over Water Sudbury River	Middlesex	2 — Critical	10,086	Fair
HWY Russells Mil over Water Paskamansett River	Bristol	3 — Serious	9,957	Fair
St141 Appleton ST over Water First Level Canal	Hampden	3 — Serious	9,698	Poor
HWY Terr Hall Av over Water Vine Brook	Middlesex	3 — Serious	9,271	Fair
ST 27 Main ST over Water Fort Pond Brook	Middlesex	3 — Serious	9,069	Fair
US 6 Wareham Road over Water Weweantic River	Plymouth	3 — Serious	9,017	Poor
ST 32 Chesnt Hl Av over Water Millers River	Worcester	3 — Serious	8,663	Fair
US 6 Marion RD over Water Weweantic River	Plymouth	3 — Serious	8,214	Poor
St131 Sthbrdge ST over Water Quinebaug River	Worcester	3 — Serious	7,817	Poor
HWY Mendon RD over Water Abbott Run River	Bristol	3 — Serious	7,370	Poor
HWY Main ST over Water Quaboag River	Hampden	2 — Critical	7,200	Fair
HWY S Maple ST over Water Fort River	Hampshire	3 — Serious	6,538	Fair
HWY Middlesex Tp over Water Vine Brook	Middlesex	3 — Serious	6,207	Good
HWY Sundrland RD over Water Mill River	Hampshire	3 — Serious	6,078	Fair
HWY Country Way over Water Bound Brook	Plymouth	3 — Serious	5,560	Good
ST 2 A/w Broadway over Water Bent Travers Pond	Worcester	3 — Serious	5,500	Fair
HWY Cohannet ST over Water Mill River	Bristol	3 — Serious	5,357	Fair
HWY Hampshire RD over Water Spicket River	Essex	2 — Critical	5,300	Fair
HWY Lamb ST over Water Ten Mile River	Bristol	3 — Serious	4,571	Fair
HWY N Main ST over Water E Templtn Pnd Otlt	Worcester	3 — Serious	4,267	Fair
ST 6 A/crnbry HWY over Water Scorton River	Barnstable	3 — Serious	4,214	Fair
ST 2 A/w Orange R over Water Moss Brook	Franklin	3 — Serious	3,651	Fair
HWY Putnam ST over Water N Nashua River	Worcester	3 — Serious	3,500	Fair
HWY Bridge ST over Water Stony Brook	Middlesex	3 — Serious	3,400	Fair
HWY Mt Plsant Av over Water Asnebumskit Brook	Worcester	2 — Critical	3,100	Good
HWY Dunn RD over Water Br Millers River	Worcester	3 — Serious	3,000	Fair
HWY New Holland over Water Mill Brook	Hampden	3 — Serious	2,800	Fair
HWY Goulart Mem over Water Nasketucket Bay	Bristol	3 — Serious	2,785	Fair
HWY County ST over Water Ipswich River	Essex	3 — Serious	2,700	Poor
HWY Canal ST over Water Squannacook River	Middlesex	2 — Critical	2,300	Fair
HWY Center ST over Water Segreganset River	Bristol	3 — Serious	2,071	Fair
HWY Shutesbry RD over Water Roaring Brook	Franklin	3 — Serious	2,069	Fair
HWY Main ST Leed over Water S Channel Mill Riv	Hampshire	3 — Serious	2,008	Poor
HWY Main ST Leed over Water N Channel Mill Riv	Hampshire	3 — Serious	2,008	Poor
ST 8 S Wshgtn ST over Water Shaker Mill Brook	Berkshire	3 — Serious	1,739	Poor
HWY Tully RD over Water W Br Tully River	Franklin	3 — Serious	1,551	Fair
HWY Nashawtuc RD over Water Sudbury River	Middlesex	3 — Serious	1,550	Fair
HWY South ST over Water North Brook	Worcester	3 — Serious	1,422	Fair
HWY Main RD over Water Hop Brook	Berkshire	3 — Serious	1,413	Fair
HWY Bridge ST over Water Mill River	Hampshire	2 — Critical	1,400	Poor
ST 71 Grn Riv Val over Water Green River	Berkshire	3 — Serious	1,380	Fair
HWY Upper RD over Water Deerfield River	Franklin	2 — Critical	1,300	Fair
HWY Hecla ST over Water West River	Worcester	3 — Serious	1,184	Fair
HWY Bridge ST over Water Ten Mile River	Bristol	3 — Serious	1,071	Fair
HWY Plymouth RD over Water Charles River	Norfolk	3 — Serious	1,000	Fair
HWY Elm ST over Water Charles River	Norfolk	3 — Serious	1,000	Fair
HWY River ST over Water Millers River	Worcester	3 — Serious	1,000	Fair
HWY Warwick RD over Water Mill Brook	Franklin	3 — Serious	647	Fair
HWY Warwick RD over Water Mill Brook	Franklin	3 — Serious	647	Fair
HWY Loomis ST over Water Munn Brook	Hampden	2 — Critical	646	Fair
HWY Shaker RD over Water Catacunemaug Brook	Middlesex	3 — Serious	600	Good
HWY Tall Pines L over Water Trib To Ten Mile R	Bristol	3 — Serious	571	Good
HWY Skyline Trl over Water Roaring Brook	Hampden	3 — Serious	536	Fair
HWY Scadding ST over Water Snake River	Bristol	2 — Critical	517	Poor
HWY Blandf Stage over Water Stage Brook	Hampden	2 — Critical	517	Poor
HWY Mill ST over Water Mckinstry Brook	Worcester	3 — Serious	517	Poor
HWY Mill ST over Water Baker Brook	Worcester	3 — Serious	500	Fair
HWY East ST over Water Dead Br Wstfld Riv	Hampshire	2 — Critical	388	Fair
Old South Street over Quinebaug River	Worcester	3 — Serious	300	Good
Doane Hill Road over Tully River	Worcester	3 — Serious	200	Fair
HWY Farley RD over Water Millers River	Franklin	3 — Serious	140	Fair
HWY Windsor Bush over Water Windsor Jambs Brk	Berkshire	3 — Serious	129	Poor
HWY Sibley Road over Water Pelham Brook	Franklin	3 — Serious	129	Fair
HWY Bridge ST over Water Blackstone River	Worcester	3 — Serious	100	Poor
HWY Cove ST over Water Seven Mile River	Worcester	3 — Serious	75	Fair
New Boston Road over Miller River	Worcester	3 — Serious	50	Good
Goodnow Road over Priest Brook	Worcester	3 — Serious	50	Fair
Old Route 8 over Farmington River	Berkshire	3 — Serious	40	Fair
Pine Plains Road over Muddy Pond Brook	Worcester	3 — Serious	20	Good
Burgess Road over Priest Brook	Worcester	3 — Serious	20	Fair
HWY Box Mill RD over Water Elizabeth Brook	Middlesex	2 — Critical	10	Poor
Old Mashpaug Road over Quinebaug River	Worcester	3 — Serious	5	Good
HWY Hospital RD over Water Quaboag Stream	Hampden	3 — Serious	0	Poor