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Conservation commission backs Cohass Avenue drainage fix; city seeks NHDES wetlands permit
Summary
City of Manchester staff described plans to replace degraded culverts near Cohass Avenue and requested a letter of support for a New Hampshire Department of Environmental Services dredge-and-fill wetlands permit. The commission voted to issue the letter.
At its March 27, 2025 meeting, the Manchester Conservation Commission voted to issue a letter of support for a City of Manchester drainage project on and near Cohass Avenue that will require a New Hampshire Department of Environmental Services (NHDES) dredge-and-fill wetlands permit.
City Environmental Protection Division staff described the project as a targeted replacement of degraded corrugated metal pipe (CMP) culverts and related headwalls, plus additional catch basins, intended to address recurring sinkholes and localized flooding where water jumps curbs and flows into nearby driveways. Rebecca Baldy, who presented the project for the City of Manchester Environmental Protection Division, said the culvert running under a driveway has deteriorated, washing away soil and…
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