3. Full -intensity photo inventory (1 hour and 30 minutes per lake). 



a. Inventory all lakes and ponds within each drainage basin by lake type, size class, 

 elevation, water clarity, and shore cover. Measure area of all lakes over 1 acre in size by dot- 

 count procedures . 



b. Classify all lakes over 1 acre in size as "deep," or "shallow." Classify as "deep" 

 if measured bank slopes exceed the table values, "shallow" if they do not. 



c. For all lakes classified as "deep, " plot the 15 -foot depth line from 5 to 10 meas- 

 ured bank slopes and compute the shallow zone area by dot -count procedures. 



Any further details unobtainable by a full -intensity inventory must be gathered on the 

 ground. In the Uinta Mountains, field measurements cost approximately seven times as much 

 per lake as fiill -intensity photo measurements. However, they may often be justified after photo 

 techniques have been used to identify the lakes most likely to offer outstanding opportunities for 

 recreation. 



STREAM INVENTORY 



The primary objective of a stream inventory from aerial photos is to evaluate the stream 

 resource of each drainage unit in terms that allow comparison with the stream resource in other 

 units. If a higher intensity inventory is desired, however, the same techniques can be used to 

 describe individual segments of a stream, so as to allow comparison of different parts of the 

 same stream. For example, streams can be described in 1-mile segments, permitting the 

 identification of iinique or separate sections of a given stream. 



The time requirements for stream inventories cannot be estimated as easily as those for 

 lake inventories, because streams vary greatly in length. However, as a rough guide, most 

 streams can be adequately classified in 4 hours. The description of a particular segment of a 

 stream will take between 2 and 3 hours. 



18 



