The watershed is generally rugged and 

 hilly throughout its area . In the lower mile the 

 river banks rise sharply from the stream to a 

 height often exceeding 100 feet . The banks rise 

 to heights of about 200 feet in the next mile and 

 a half upstream. The valley is wider and flat- 

 ter in the area from 2 .5 to 4.0 miles up with 

 the hills again closing in above the 4 -mile point. 

 From 6 to 8 miles up there are rugged banks 

 ranging from 350 to 600 feet in height . The 

 upper 2 miles of the stream and Tilden Pond 

 are in a saucerlike flat where several meadows 

 and swampy areas occur. 



Most of the watershed is covered with 

 second- and third -growth alder, willow, birch, 

 maple, beech, oak, pine, spruce, and fir, 

 which usually extends to the water's edge. The 

 many abandoned farms are reverting to brush 

 and to forest growth. 



Width and depth 



3 c.f.s. at a point 3 miles above the mouth and 

 1 to 2 c.f.s. at 5 miles up. The flow was in- 

 termittent from the 7 -mile point to about 300 

 yards below Tilden Pond which had an outflow 

 of 1 to 2 second-feet. 



Temperatures 



Water temperatures ranging from 65° F. 

 to 83° F. were recorded during the period of 

 the survey. The high temperature of 83° F. was 

 recorded in Kendal Brook, a short distance be- 

 low the outlet of Pitcher Pond, and clearly 

 showed the heating effect of sunshine on the 

 surface of the pond . 



In the main river a maximum tempera- 

 ture of 79° F . was recorded below the outlet of 

 Tilden Pond. The temperature dropped in the 

 shaded areas further downstream to reach a 

 recorded low of 65°F. at a point about 5 miles 

 above the mouth. 



In the lower 3 miles the stream channel 

 ranged from 20 to 50 yards in width, but 

 drought had so reduced the stream flow that 

 only one -third to one -half of the channel was 

 water -covered. Above the 3 -mile point the 

 water depth ranged up to 3 inches in a channel 

 ranging from 3 to 5 feet in width . In these 

 sections the normal stream channel appeared 

 to be 10 to 30 feet wide . In some areas, par- 

 ticularly in the upper sections of the stream, 

 there was scarcely any flow above the surface 

 of the gravel although the water was normally 

 2 to 5 inches deep. Most of the pools were less 

 than 3 feet deep, although many ranged up to 6 

 feet deep in sections well shaded by bank growths 

 or brush and trees . 



Bottom composition 



The composition of the bottom in pools 

 and riffles is summarized in table 5. Here 

 again, as with the Sheepscot River data, the 

 figures are believed to be conservative due to 

 the drought conditions . 



Stream flow 



The survey party estimated the stream 

 flow at 5 to 8 c.f.s. just above tidewater, 2 to 



Obstructions 



Obstructions to fish migration in the 

 Ducktrap and its tributaries are summarized 

 in table 6 . A brief description of the barriers 

 is given along with their effects and recom- 

 mendations on their possible alteration. A 

 total of 12 barriers to fish migration have ex- 

 isted at one time or another. Three of the 

 obstructions no longer exist, but the remaining 

 9 need alteration if full protection to migrating 

 fish is to be provided. 



Pollution 



The only pollution noted was the effluent 

 of the sewer outlet from a summer camp 2.8 

 miles above the mouth. The stream was clouded 

 for about one -half its width and extending down- 

 stream for about 50 yards . 



Predators 



The only predators observed other than 

 fish were two mergansers, one mink, and a 

 few kingfishers . 



14 



