National Program for Inspection of Non-Federal Dams. Rockwell Pond Dam (MA 00882), Merrimack River Basin, Leominster, Massachusetts. Phase I Inspection Report.
CORPS OF ENGINEERS WALTHAM MA NEW ENGLAND DIV
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Rockwell Pond Dam is a 460-foot lon, 20-foot high earthfill dam built in the 1800s. The 75.7-foot long, modified sharp-crested spillway has a crest at El 416.4. A concrete bridge spans the spillway channel. The main outlet is a 12-inch diameter pipe controlled by a valve which is submerged in a manhole. The following deficiencies were observed at the site mssing riprap and localized growth of brush and small trees on the upstream face of the right embankment localized erosion of upstream and downstream earth slopes voids exposing soil behind the spillway weir wall cracked or missing mortar from joints in the spillway training walls spalled concrete and exposed reinforcing steel on the bridge pier efflorescence and spalling on the underside of the bridge deck a submerged inoperable valve on the main outlet and an inoperable slide gate on the intake of the auxiliary outlet. The test flood would overtop the dam by about 1.6 feet. The spillway can discharge 60 percent of the test flood before the dam is overtopped.
- Hydrology, Limnology and Potamology
- Civil Engineering