Flood Inundation Extents for Flows of 800 to 3,080 cfs at Gage 14211500, Johnson Creek near Sycamore, Oregon (sycor.shp)
The basis for these features is U.S. Geological Survey Scientific Investigation Report 2017-5024 Flood Inundation Mapping Data for Johnson Creek near Sycamore, Oregon. The domain of the HEC-RAS hydraulic model is a 12.9 mile reach of Johnson Creek from just upstream of SE 174th Avenue in Portland, Oregon to its …