Massachusetts Stream Crossing Standardswww.streamcontinuity.org/publicationsEstablish minimum criteria necessary tofacilitate fish and wildlife movement andmaintain stream continuityUse of these standards alone will notsatisfy the need for proper engineeringand design.
• General Standards– Open-bottom span preferred– If culvert, then embedded:• Min. 2ft (and at least 25% for roundpipe culverts)• Include substrate >15 inches indiameter, depths at least 2x D84 ofembed material– Min. 1.2x bankfull width– Matches stream substrate– Openness: 0.25m– Banks on both sides of stream,match horizontal profile ofexisting stream and banks• Optimum Standards– Bridge– Min. 1.2x bankfull width– Matches stream substrate– Openness: 0.5-0.75m, Height:6-8ft– Banks on both sides ofstream, match horizontalprofile of existing stream andbanks, sufficient headroomfor wildlifeMassachusetts Stream Crossing Standards
These or similar standards are required tobe met under:• U.S. Army Corp of EngineersMassachusetts General Permit(July 2011)• Massachusetts 401 Water QualityCertification (314 CMR 9.00, June2009)• Further, the performancestandards in the WetlandsProtection Act (310 CMR 10.00,June 2009) require crossings tomaintain the carrying capacity ofthe channel.• DEP Regulatory Reform – includepermit streamlining for ecologicalrestoration, including culvertreplacements
• 2- 10 foot box culverts washed out in 2003. Road was closed to all traffic.2- 10 foot box culverts washed out in 2003. Road was closed to all traffic.• Culvert had a history of clogging with debrisCulvert had a history of clogging with debrisBronson Brook, WorthingtonBronson Brook, WorthingtonDesign with the river in mind!
Bronson Brook During IreneBronson Brook During Irene
Bronson Brook Post IreneBronson Brook Post Irene• A channel spanning treelocated upstream of this culvertprior to the storm was mobilizedand easily passed through thiscrossing.• Road remained open andpassable.
Green Mountain National ForestFR17A/Jenny Coolidge BrookBottomless Arch OutletCompeted Channel Construction2010Post TS Irene September 2011Lost largest boulders near outlet and roughness along stem walls. Structure and roadundamaged.
Green Mountain National ForestFR54/ Sparks Brook Bottomless Arch Inlet and OutletPre-Irene July 2011 Post TS Irene September 2011Flood Stage
“Being in the floodplain is likesitting down in the bathtub”~Robert HunterTake home messages:•Use up-to-date data forsizing culverts and locatinginfrastructure•Increase infiltrationwherever possible•Design with the river in mind•Minimize stream bankhardening•Protect floodplains fromdevelopment