Historical bathymetric changes near the entrance to Grays Harbor, Washington

• Main Authors: Burch, T.L., Sherwood, C.R. (Battelle/Marine Sciences Lab., Sequim, WA (United States))
• Other Authors: United States. Department of Defense.
• Format: Report
• Language: English
• Published: Pacific Northwest Laboratory 1992
• Subjects: Usa 540250* > Environment; Terrestrial > Site Resource & Use Studies > (1990-); Coastal Regions; Sediments; North America; Washington; Shores; Erosion; 54 Environmental Sciences; Bathymetry; Developed Countries; 540350 > Environment; Aquatic > Site Resource & Use Studies > (1990-); Dredging; Half Moon Bay; Long Rock; Moon Bay; Outer Bar; South Beach; The Spit
• Online Access: https://doi.org/10.2172/6615253; https://digital.library.unt.edu/ark:/67531/metadc1193426/

Large changes in the distribution of sediment near the entrance to Grays Harbor, Washington, have occurred since the long rock jetties were built to confine flow. Spits to the north and south of the entrance have grown, the entrance channel has deepened, and the outer bar has eroded and moved offshore. The shorelines of North Beach and South Beach have experienced significant amounts of both erosion and accretion since the jetties were constructed around the turn of the century. Recently, the erosion rate at South Beach has increased and, because Half Moon Bay is growing at the expense of the shoreward side of Point Chehalis, the vegetated portion of the spit is now less than 350 ft wide at the narrowest section. The US Army Corps of Engineers, Seattle District, requested that Battelle/Marine Sciences Laboratory evaluate long-term trends in erosion near the entrance to Grays Harbor.