study year. The profiles were obtained from fathometer tracings and 

 Emery's (1961) method of stake and horizon profiling. 



The basic procedure was to move the boat out from the shore along the 

 profile line until the bar and trough topography had been traversed. This 

 was generally at a depth of about 20 feet and a distance of 1,500 to 2,000 

 feet from shore. At this point the boat was turned around and a traverse 

 was run toward shore, until depth restrictions prohibited continuing far- 

 ther (usually at a depth of 3 to 4 feet) . Two people on the shore profiled 

 to a depth of 4 to 5 feet to permit construction of a complete profile. 



Detailed nearshore bottom profiles are also available from previous 

 studies in this area (Davis, 1964; Davis and Fox, 1971), specifically at 

 sites 11 (1970), 13 (1963), 16 (1969), and 17 (1963). Profile lines re- 

 ported in Saylor and Hands (1970) are near sites 5, 6, and 7. The profile 

 line at site 5 of this study is identical with profile line 32 of Hands 

 (1976); profile site 6 is a little north of Hands' (1976) number 17, and 

 profile site 7 is just south of Hands' (1976) number 24. 



Initially, it was anticipated that data on the location of longshore 

 bars could also be obtained from the long-term aerial photo study. Be- 

 cause of turbid water, wave activity, and reflections from the water sur- 

 face, there were too few photos from which reliable data could be collected. 



2 . Nature of the Profiles . 



Although the two-bar configuration is prevalent throughout the area, 

 there are locations where one or three bars are present. A shallow, ephem- 

 eral bar was also present at nearly one-half of the sites. The ephemeral 

 bar was defined as any bar with a crest of 3 feet or less below lake level. 

 This bar was present at eight sites (Table 8) with crests ranging from 2.4 

 to 3.0 feet deep and 80 to 175 feet from shore. The nature of these bars 

 is such that they may be present or absent at any site during any survey 

 period. However, no evidence for the presence of these ephemeral bars was 

 observed during any survey at sites 1, 10, 12, 13, and 17. Coincidently, 

 these are the beaches that have the coarsest mean grain size. During 

 August 1963 an ephemeral bar was present at site 13 (Davis, 1964). 



The first relatively stable longshore bar was present at all profile 

 sites except site 13. The crests of this bar ranged from 3.3 to 8.0 feet 

 in depth and 150 to 525 feet from shore (Table 8; Figs. 11 and 12). At 

 nearly every site this bar was well developed. 



The second bar was present at all sites with its crest ranging from 

 580 to 1,625 feet from shore at depths ranging from 7.6 to 14.5 feet below 

 lake level (Table 8). At five sites there was a third bar present. The 

 crest of all of these fell within a rather narrow distance from shore 

 (1,100 to 1,375 feet) with crest depths ranging from 11.2 to 16.0 feet 

 below lake level. 



52 



