Owner: Robert Weems 



Designer: David S. Miller 



(2) Perf ormance. There are no data available. 



d. Discussion. The breakwater is an innovative use of surplus mate- 

 rial. The pipe and anchor chain, available at scrap metal prices, should pro- 

 vide better protection than the old log breakwater it replaces. The design 

 allowed the owner to do the towing and much of the installation which mini- 

 mized costs. 



^* Friday Ha rb or, Washington (Port of Friday Harbor) . 



a. Location. Port of Friday Harbor, Washington (Fig. 17), is a major 

 stopping point for pleasure craft enroute to Canadian waters as well as to 

 cruises in the San Juan Islands, It is also a stop for the Washington State 

 Ferry System, which serves the islands, and is a connection to Vancouver 

 Island (Canada). Fishing vessels also use the harbor. 



b. Site Conditions. As shown in Figure 17, there are two windwave expo- 

 sures — to the southeast with a fetch of about 1 nautical mile and to the 

 northeast with a fetch of about 2 nautical miles. Windspeeds associated with 

 the northeaster that affects the region every few years reach the 50-knot 

 range with gusts to 70 miles per hour and impose the critical design condition 

 for the breakwater because of the longer fetch in that direction. A set of 

 speed-duration curves is shown in Figure 18. 



Tide data are as follows: 



Highest (30 December 1952): 11.00 feet MLLW 



MHHW: 7.70 feet 



Mean: 4.75 feet 



MLLW: 0.00 foot 



Lowest (15 January 1949): -3.80 feet 

 Tidal currents are less than 1 knot. Bottom elevations are as follows: 



Along inner row of anchors: -52 feet MLLW 



Along main breakwater: -42 feet 



Along inner row of anchors : -30 feet 



Wave heights and periods of 2.9 feet, 2.8 seconds from the northeast and 

 2.9 feet, 2.4 seconds from the southeast were measured by the U.S. Army Engi- 

 neer District, Seattle, during an observation period 1969-71. Similar wave 

 measurements were recorded from December 1974 to March 1975 by a University of 

 Washington project. However, neither of these monitoring periods was opera- 

 tional when the critical northeaster occurred. Wakes from boats are a common 



33 



