|The view along the base of Ediz Hook, with Mt. Baker in the distance|
Coming to the end of the Hook; this is the only bit of the Hook that is unarmored, and these profile data suggest that Ediz Hook has been getting longer since 2012 - about 10m over that time period for an average rate of growth of ~2m/yr. Interestingly this growth rate exceeds the average growth rate for 1870-1917 (1.3 m/yr) previously reported by Galster and Schwartz in their 1990 paper on Ediz Hook, and is quite a bit higher than the average rate of growth they identify for the "modern" era (1948-1970; 0.6 m/yr). Whats going on here? Is this a dam removal thing? I don't think so. Here is the final profile:
Its a bit hard to see here since I am showing a profile that cuts across the entire distal bulb of the Hook, but the Strait side of this profile is just to the east of the end of the rip rap that covers most of the Strait-side of the Hook. And what is clear from the aerial photo above is that there is end-cutting, or erosion, just to the west of the end of this rip rap...its hard to see in the profile, but I estimate that the shoreline has eroded about 6m since 2012. Interestingly there has been no growth of the shoreline on the harbor side of the Hook...so in essence the Hook, at its tip, is getting skinnier, and my hunch is that the erosion of the the Strait side of the distal end of the Hook is supplying the sediment that is lengthening the spit. So the distal end of Ediz Hook is getting longer, but since its also getting skinnier my conclusion is that this is NOT due to a sediment supply from the Elwha Dam removal.