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This is a shallow, old reservoir on the east side of County Road 23, with a parking area and a gravel boat ramp at the entrance. (When the reservoir is dry, as it sometimes is in summer, one can drive down the ramp to the edge of the water, wherever that may be). There is a path around the top of the reservoir but with a scope, one can view the entire area from the west and south sides, from which the light is favorable except in the early morning.
From Ohio Ornithological Society
Tips for birding Fostoria Reservoirs
The Fostoria reservoirs provide easy in and out birding for all six reservoirs including Mottram and Lamberjack next to it. Easy parking access for these tandem reservoirs. Recently all three scoters and Long-tailed Ducks have been reported on these waters during migration. Given the ease of access and quick check ability, they are worth checking when you are in the area. You can walk around them easily and the woods offers some songbird birding.
From Vic Fazio
About Lake Mosier
Lake Mosier is an upground reservoir and is fed off stream by the East Branch Portage River in Hancock County, Ohio and is used for drinking water and recreation purposes. It was built in 1941. It has a normal surface area of 90.6 acres. It is owned by the City Of Fostoria.
Lake Mosier Upground Reservoir is of earthen construction. Its height is 25 feet with a length of 8125 feet. Its capacity is 1207 acre-feet. Normal storage is 740.4 acre-feet. It drains an area of 0.14 square miles.
From FindLakes website
No restroom facilities.