Eastern cottonwood (Populus deltoides Bartr. ex Marsh.) was the predominant species on the main channel. Sampling in the north fork included considerable honey locust (Gleditsia triancanthos L.), a species which was not encountered while sampling the main channel. Salt cedar clumps (Tamarix pentandra Pall) were common on the Grassland.

The sampling design featured transects crossing the river channel on which 0.1-acre fixed-radius plots were established at 6-chain intervals. Trees smaller than 3.5-inches were sampled on four 0.01-acre subplots within each 0.1-acre plot. The sample included counts of salt cedar clumps located on 0.1-acre plots. Most of the sampling on the main channel was completed during the summer and fall of 1999. In addition to eastern cottonwood the main channel also contained sandbar willow (Salix interior Rowlee) and smaller amounts of peachleaf willow (Salix amygdaloides Anderss.) and western soapberry (Sapindus drummondii Hook. and Arn.). Sampling in the north fork area was completed during the spring of 2000.