- 2020 Water Quality Report & Long Term Data Assessment - October, 2021
- Monitoring of Eastern Pondmussels and Co-occurring Mussel Species in Highland Lake Report prepared by Biodrawversity, LLC - November, 2020
- Sucker Brook Pipe Failure State Engineering Report - December 28, 2018 (with ADDENDUM), Revised November 9, 2019
- Highland Lake Post-Treatment Milfoil Locations - August, 2019
- Evaluation of Lake Level Drawdown 2008-2016 prepared by Northeast Aquatic Research, LLC - February 28, 2017
- 2009/2010 Monitoring Results prepared by Northeast Aquatic Research, LLC - February 11, 2011
- Highland Lake Drainage Study prepared by WMC Consulting Engineers May 1993
- Highland Lake Management Plan - September, 1991
- Dredging Feasibility Study prepared by WMC Consulting Engineers - June, 1991
- Highland Lake Macrophyte Plan prepared by Ecosystem Consulting Service, Inc. - November, 1985