Grassy Lake Wildlife Management Area, also referred to as Grassy Lake WMA, is a 12,983 acres (5,254 ha)[2] protected area located in northern Avoyelles Parish, Louisiana, with limited land access and water access from the Red River.

The main road access from LA 451 crosses the levee at the Bayou des Glaises flood control structure (floodgate crossing), following Bayou Natchitoches road across the northern portion of the WMA, and ends at Smith Bay on the east side at the Red River.

Bayou Natchitoches traverses the area that supports an over-cover of bottomland hardwood such as willow, cypress, bitter pecan, swampprivet, water elm, overcup oak, cottonwood, sycamore, honey locust, and hackberry.

The understory vegetation is typical of the poorly drained land and includes buttonbush, deciduous holly, smilax, dewberry, rattan, peppervine, as well as annual grasses and sedges.

[9] Grassy Lake WMA has swamp rabbits, deer, squirrels, wild turkey, woodcock, waterfowl, largemouth bass, crappie, bream,[10] and alligators[11] The WMA was closed during the March 2018 flooding that included the closing of fourteen roads in the Richard K. Yancey Wildlife Management Area in Concordia Parish,[12] and reopened in March.