Table 29
Siuslaw River
Florence, Oregon
Construction and Rehabilitation History
The original project was authorized,
1890
The original project was modified. The project included a
1891
channel maintained by two high-tide rubble-mound jetties that were
600 ft apart at the ends. The north jetty was 7,500 ft long; the
south jetty was 5,600
long.
Construction began on the north jetty.
1893
The project was suspended. The north jetty had been constructed to
1905
4,090 ft, and work had not been started on the south jetty.
The existing project was adopted. The project included an 8-ft-deep
1910
bar channel maintained by two high-tide rubble-mound jetties that
were 750 ft apart at the ends. The north jetty would be extended by
3,700 ft, and the south jetty would be 4,200 ft long.
Work on the jetties was suspended.
1912
The south jetty was repaired and extended.
1917
The jetties were completed. The north jetty was 7,490
long and
1917
included 441,237 tons of stone, The south jetty was 3,945 ft long
and used 196,860 tons of stone. Both jetties had crest elevations of
ft mllw, crest widths of 15 to 20 ft, and side slopes of
to
1 :2.
1955
accelerated in 1955 when a portion of the jetty near shore that had
been constructed in 1912 was exposed.
armor stone used were over
The north jetty was repaired. Class
1957
6 tons each and averaged 10 tons. Class
stone was over 1 ton and
averaged tons.
The 600-ft extension to the north jetty was approved but deferred.
1958
The outer 300 ft of the south jetty was at mllw. The crest of the
1961
to
mllw.
rest of the jetty varied from
An aerial photograph of the jetties taken in 1969 is presented in
1969
Figure 60.
(Continued)
130
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