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Ulbrich Reservoir, Wallingford
ulbrich_res_thumb.jpg
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   Ulbrich Reservoir is a 154 acre public drinking water supply. Public access is prohibited. The reservoir is surrounded by forest, and a steep ridge rises from the water to a ridge on the lake’s eastern side. The invasive Eurasian watermilfoil (Myriophyllum spicatum) was the most abundant of nine aquatic plants recorded in our July 2005 survey. The species occurred in water from 3 - 13 feet (1 - 4 m) deep all around the lake, although it was most abundant in the lake’s south end, where it formed a continuous band along the eastern and western shores. Myriophyllum spicatum extended as much as 175 feet (50 m) from shore in shallow water at the southern end of the reservoir. M. spicatum occurred in scattered patches on the east and west sides in the northern half of the reservoir, and it grew densely in a  10 feet (3 m) wide band in front of a dam at the north end.

   No other species was nearly as abundant or frequently found. Coontail (Ceratophyllum demersum) occurred in scattered locations around the lake, primarily at the southern end, where it grew abundantly with M. spicatum. Smartweed (Polygonum amphibium) occurred in several locations on the eastern shore and in shallow water at the extreme northwest of the lake. Several other species were recorded in the same area, including duckweed (Lemna minor), snailseed pondweed (Potamogeton bicupulatus) and Polygonum amphibium.

   Fine-leaf pondweed (Potamogeton pusillus) and bushy pondweed (Najas flexilis) were observed in several patches near the shore at the southern end of the reservoir. Both species also occurred among Myriophyllum spicatum along the western shore in the southern half of the reservoir, as did Ceratophyllum demersum and false loosestrife ( Ludwigia palustris).

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Species recorded in our 2005 survey of Ulbrich Reservoir. Click on plant to view herbarium mount. (invasive species in bold)

Ceratophyllum demersum

Lemna minor

Ludwigia palustris

Myriophyllum spicatum

Najas flexilis

Polygonum amphibium

Potamogeton bicupulatus

Potamogeton pusillus


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