Eurasian Watermilfoil Monitoring and Management Assessment in the Pend Oreille Lake and River System, Idaho.

Madsen, J. D., Wersal, R. M., & Woolf, T. E. (2009). Eurasian Watermilfoil Monitoring and Management Assessment in the Pend Oreille Lake and River System, Idaho. Western Aquatic Plant Management Society Annual Meeting,. Honolulu, HI: 30 March - 1 April 2009.

Abstract

The Pend Oreille Lake and River system is the largest freshwater body in the State of Idaho, encompassing 92,000 acres. Eurasian watermilfoil (Myriophyllum spicatum L.) has spread throughout much of the systems littoral zone, reducing native plant growth and diversity. We surveyed the entire littoral zone of the lake and river using a point intercept survey covering almost 1700 points in June and August of 2007 and August 2008, in a uniform grid with points 250 m apart in waters of less than 45’ deep. Eurasian watermilfoil distribution throughout the lake declined from 12.5% in 2007 to 7.9% in 2008 (p