Zebra Mussel Monitoring Project (ZMMP)

Ray Roberts Lake

About Ray Roberts Lake

Sources for characteristics are linked from the characteristic's value. Conservation pool elevation datum is NGVD29.

Impoundment Year 1987
Drainage Area 692 mi2
Capacity 788,167 acre-ft
Conservation Pool Elevation 632 ft
Counties Cooke, Denton, Grayson
Primary Uses Water Supply , Recreation
Additional Resources Texas Parks and Wildlife - Ray Roberts Lake
Water Data for Texas - Ray Roberts Lake
Texas Water Development Board - Ray Roberts Lake
US Army Corps of Engineers - Ray Roberts 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
06/17/2020 < 0.01 per Liter 10/02/2012

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
11/18/2019 04/24/2013

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.

Water-Quality Graphs

Select a parameter to view graphs of data collected at all Ray Roberts Lake sites.