sentences:  As late as 2001 spawning gravel studies were conducted in Calabazas along with Graham Creek, Bear Creek, Carriger Creek and mainstem Sonoma Creek; these studies demonstrated that adequacy of spawning gravels and absence of sedimentation are not limiting factors for anadromous fish propagation.Steelhead were found to be present during the District's resource inventory phase of preparing the 2016 Resource Management Plan.The upper reaches of Calabazas Creek are relatively pristine with a dense forest canopy of mixed oak woodland, while the lower reaches on the Sonoma Valley floor have considerable encroachment by rural residential development, vineyards and other agricultural uses.