The lake is under the management of the U.S. Army Corps of Engineers. The Corps also manages surrounding the lake as well as the Republican River near the lake. Corps staff conduct safety inspections on the dam, working directly with the Kansas District Water Management to determine how much water is released from the reservoir into the Republican River. Corps Staff are also responsible for the upkeeps of the roads, utility systems, campsites, beaches, boat ramps, and picnic areas in and around the lake. The Corps also works directly with
Nebraska Game and Parks Commission to manage the natural resources of Harlan County Lake.
Fish The Harlan County Lake has fish species such as
walleye,
white bass,
wipers,
catfish,
crappie and
pike.
Ice fishing is popular on the reservoir as well.
Birds According to the Nebraska Birding Trails website, birds found at Harlan County Reservoir have included
common loon,
black-legged kittiwake,
parasitic jaeger,
little blue heron,
white-faced ibis, and
Sabine's gull. Bald eagles are also often spotted in the latter fall and winter months, especially at the Western end of the lake near Alma. Many migratory birds rely on Harlan county Reservoir each year as they pass through. With an abundance of water in the lake and river, and the thousands of acres of green
wheat and
corn stalks, this area is crucial as the thousands of ducks and geese fly south to their mating grounds.
Mammals The shoreline and rivers surrounding the reservoir sustain many mammal species.
Beaver and
muskrat use the muddy banks of the small creeks and streams in and out of the lake as habitat. This is a prime area for such creatures needing the smaller willows and trees to make their dams and huts. The thick brush of the river bottom ground is some of the state's best
whitetail deer hunting habitat.
Field mice,
moles,
ground squirrels,
rabbits,
raccoons,
opossum,
skunk,
badger,
coyote,
bobcat and many more rely on the habitat supported by the lake for their survival.
Plants The main habitat of the Harlan County Lake area is mixed prairie grasses. According to the U.S. Army Corps of Engineers these prairies consist of
Big and
Little Bluestem, Indian grass, western wheatgrass,
buffalo grass,
blue gramma and switch grass. Much of the area is covered by trees and brush as well. A strand of Cottonwood, ash, cedar, and maple trees just to name a few are found all along the Republican River and other lowland inlets leading up to the lake. The plants of any ecosystem make up most of the habitat. == Land maintenance ==