Halls Pond, Ashford


2005 Aquatic Plant Survey Map of Halls Pond

(1.5 MB, .pdf format*)

Transect Data (259 KB, .pdf format*)  | Water Data

Halls Pond is state owned, and land along the southern shore is part of Natchaug State Park. A road runs along the northern and northeastern shores, and two homes have been built at the southeastern end of the lake. The area around the 82 acre lake is otherwise forested and undeveloped. The lake has an average depth of 9 feet and a maximum depth of 14 feet. The bases of large trees, which were not removed when the land was flooded, can be seen reaching nearly to the surface of the water, especially in the coves in the southwestern part of the lake. Boat access is by an unimproved ramp on the eastern shore.

Halls Pond has very clear water, and supports a community of 16 submerged and floating-leaved aquatic plants. The most abundant species during our August 2005 survey was Potamogeton robbinsii, which formed an uninterrupted carpet across the lake where water was 1 m or more deep. Other species occurred primarily in small patches in shallow water around the edges of the lake and around 12 small islands.

Species richness was greatest along the northern shore with patches of Brasenia schreberi, Charaphyte, Ceratophyllum echinatum, Nuphar variegata, Elodea nuttallii, Eriocaulon aquaticum, Spirodela polyrhiza, Utricularia gibba, Gratiola aurea, Isoëtes X eatonii, Elatine minima, Potamogeton bicupulatus and Sagittaria sp.  Occurring in a narrow band of shallow water around the rest of the lake was Gratiola aurea, Elatine minima, Eleocharis sp., Eriocaulon aquaticum, Potamogeton bicupulatus, and Sagittaria sp..  Isoëtes X eatonii and Elodea nuttallii also occurred in patches along the east shore with Ludwigia palustris, while Spirodela polyrhiza occurred in patches along the south shore.  Najas flexilis and Potamogeton epihydrus were found in patches on the west shore, and Potamogeton epihydrus was also found on the south shore along with Pontederia cordata

Filamentous algae were abundant in one area along the northeast shore, growing thickly on the Potamogeton robbinsii as far as 75 feet (20 m) from the shore. Shallow water around the lake’s many islands supported scattered plants of Gratiola aurea, Sagittaria sp., Elatine minima and Eleocharis acicularis.

Find Common Plant Names

(65 KB, .pdf format*)

Species recorded in our 2005 survey of Halls Pond. Click on plant to view herbarium mount. (Invasive species in bold)

Brasenia schreberi

Ceratophyllum echinatum


Elatine minima

Eleocharis sp.

Elodea nuttallii

Eriocaulon aquaticum

Gratiola aurea

Isoetes X eatonii

Ludwigia palustris

Najas flexilis

Nuphar variegata

Pontederia cordata

Potamogeton bicupulatus

Potamogeton epihydrus

Potamogeton robbinsii

Sagittaria sp.

Spirodela polyrhiza

Utricularia gibba

*NOTE: Some of these documents are provided in Adobe® Acrobat® (.pdf) format. In order to view or print these documents you need Adobe® Reader®.  If you do not have Adobe® Reader®, click the "Get Adobe® Reader®" image for a free copy.

Get Adobe Reader