A resource classification and vegetation change analysis of the Jackson-Frazier Wetland, Benton County, Oregon Public Deposited



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  • Benton County established the Jackson-Frazier Wetland as a park in 1992. My project was undertaken to assist Benton County Parks in managing the wetland. The project contains two elements: a GIS and a vegetation change analysis from 1936 to 1994. GIS coverages created in ARC/INFO were: 1) the course of the Jackson and Frazier Creeks as they enter the wetland; 2) study area boundary; 3) county ownership; 4) National Wetland Inventory map of wetland types; 5) ground control points selected for registration of the 1994 airphoto; 6) a generalized vegetation type map derived from Marshall's (1985) detailed plant community map; and 7) three classified vegetation maps from 1936, 1979 and 1994. My second objective was to assess the change in wetland vegetation over sixty years and involved a vegetation change analysis by classifying vegetation from airphotos of the wetland from 1936, 1979, and 1994. Wetland vegetation changed from a prairie-dominated landscape in 1936 to a forested wetland in 1994. Forest was initially confined to the northern portion of the wetland along the Jackson-Frazier Creek, but subsequently spread south and westward. Shrub-scrub also increased between 1936 and 1994 and the total area of emergent wetland remained relatively unchanged. Management manipulation might be required to further prevent the wetland progressing to a forested state.
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