New York /

Lake Welch

Reservoir in New York · 202 acres · near Thiells

Lake Welch has 1 boat ramp listed as public.

Invasive species

NYS DEC records Eurasian watermilfoil (latest 2022) and variable-leaf milfoil (latest 2022) in this water. Clean, drain and dry your boat, trailer and gear before you leave, and do not move water, plants or live bait to another water.

NYS DEC · checked October 18, 2026

Past algal blooms

Harmful algal blooms reported on this water (state reports compiled by U.S. EPA): 2020, 2022 and 2024 to 2026.

state reports compiled by U.S. EPA · checked October 18, 2026

Launches

Wikidata: Q34901828