Zebra Mussel Monitoring Project (ZMMP)

Lewisville Lake

About Lewisville Lake

Sources for characteristics are linked from the characteristic's value. Conservation pool elevation datum is NGVD.

Impoundment Year 1955
Drainage Area 1,660 mi2
Capacity 563,228 acre-ft
Conservation Pool Elevation 522 ft
Counties Denton
Primary Uses Water Supply , Flood Control , Recreation , Power Generation
Additional Resources Texas Parks and Wildlife - Lewisville Lake
Water Data for Texas - Lewisville Lake
Texas Water Development Board - Lewisville Lake
US Army Corps of Engineers - Lewisville Lake Levels
Lake Status

Texas Parks and Wildlife Status: Infested

The water body has an established, reproducing population of zebra mussels.

Lake Map

Blue triangles show USGS data-collection locations.

Zebra Mussel Detection Data

Larvae (Veliger) Detections
Most Recent Detection First Date Detected
06/11/2020 < 0.01 per Liter 11/07/2013

Larvae detection counts are averaged across all sampling sites.

Zebra mussels typically spawn in the spring and autumn as microscopic, free swimming larvae called 'veligers'. The USGS uses fine mesh nets to sample for larvae during the spawning season.

Adult or Juvenile Detections
Most Recent Detection First Date Detected
06/11/2020 05/03/2016

Adult detection counts are averaged across all sampling sites.

At the end of their larval stage, zebra mussels attach to a substrate and metamorphose into juveniles. The USGS conducts both visual and SCUBA inspections, and deploys artificial substrates as passive samplers, to get a estimate of the juvenile and adult zebra mussel populations.

Water Quality Data

Water-quality monitoring is important for studies of zebra mussel survival, growth, and reproduction. Water-quality data are also important for risk assessments for zebra mussel infestation.