Table 49
Willapa River and Harbor and Naselle River
Willapa Bay, Washington
Date(
Construction and Rehabilitation History
Willapa River and Harbor
adopted.
1916
The Willapa River and Harbor project was modified to include the
1954
mooring basin and the breakwater at Nahcotta.
The breakwater design at Nahcotta was modified to conform to requests
1957
by local interests.
The Nahcotta breakwater was constructed. The 1,500-ft-long break-
1957-
water was of rubble-mound construction, with the crest at elevation
1958
+15 ft mllw, width of 6 ft, and side slopes of
The landward
end tied into an existing oystershell mound at the landward end of
Nahcotta Wharf. A 2-ft-thick layer of quarry spalls was extended
15 ft from the seaward toe on the channel side of the breakwater to
protect against toe scour. The breakwater required 43,700 tons of
rock to complete.
The Nahcotta mooring basin and channels were dredged.
1958
The harbor layout and breakwater cross sections are illustrated in
1985
Figure 82. There are no reports of needed repairs or
for the breakwater.
177
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