(1) All submerged and submersible land under
the jurisdiction of the Department below Head of Tide within the Siltcoos River
estuary is closed to any and all use by motor vehicles. Excepted from the
estuary closure are Government-owned vehicles on official business, motor or
non-motorized boats, vehicles used in the launching of boats at designated
launching sites, public and private utility vehicles performing company
business, vehicles involved in rescue or emergency activities, and vehicles
engaged in repair of fences and placement of bank protection
(2) Head of Tide means
the inland-most extent of tidal influence as measured by an increase in water
surface level at Mean High Tide (Mean Lower Low Water Datum).
(3) The elevation of Mean High Tide
corresponds to a tide state of about 6.5 feet (Mean Lower Low Water Datum). The
location of Head of Tide in the Siltcoos River estuary is approximately River
Mile 3, at the Siltcoos Lake Outlet (Sections 32, 33, and 34 of Township 19
South, Range 12 West, Willamette Meridian).