ERDC/CHL CHETN-III-65
March 2003
MCNP Program during the period July 1993 through June 1996 (Bottin and Eisses 1997). The outer
320 m (1,050 ft) of the main breakwater was monitored during this effort. Base conditions were
established in 1993/1994 with additional surveys in 1996. The structure was also revisited in 2000
under the "Periodic Inspections" work unit (Bottin and Jeffries 2001).
Figure 1. View of St. Paul Harbor breakwater trunk
The main breakwater has a crest elevation (el) of +371 from its origin to a point approximately
15.2 m (50 ft) north of the northernmost dock (sta 15+10). The remaining portion of the structure
has a crest el +30. Armor stone used on the breakwater trunk was 16,329.3 kg (18 tons), and
21,772.4-kg (24-ton) armor stone was used on the head. The slope of the trunk is 1V:2H with a
1V:3H slope around the breakwater head.
The initial photogrammetric survey of May 1994 revealed low areas along much of the breakwater.
Breakwater topography indicated only about 5 percent of the higher portion of the structure
(sta 7+50-15+10) was at its design el +37, and 9 percent of the lower portion (sta 15+10-18+00) was
at its design el +30. For the higher portion of the structure, the elevation of about 24 percent of the
1
Elevations (el) cited herein for St. Paul Harbor are in feet referenced to mean lower low water (mllw) datum (to convert feet to
meters, multiply number of feet by 0.3048).
2
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