Table 1 . --Descriptive data for watersheds in the Deep Creek 



study area 



Characteristic 



: 1 



Watershed No 

 : 2 : 



3 



Mean side slope gradient (percent) 



74 



65 



71 



Channel gradient (percent) 



70 



6.3 



61 



Watershed aspect (degrees azimuth) 



274 



285 



270 



Mean soil depth (inches) 



16 



22 



22 



Sediment movement in the study area is almost exclusively bedload because of the 

 extremely coarse texture of the soil and parent materials; consequently, small dams 

 were used to obtain sediment yields. Data from the sediment dams were collected twice 

 a year—following the snowmelt period (about June 1) ; and near the end of the water 

 year (about September 30). Accumulations of sediment behind dams were surveyed, using 

 a grid of closely spaced cross sections, beginning on November 1, 1960. 



Jammer roads totaling about 0.36 mile in length were built on the three watersheds 

 during October 1961; standard sidecast construction practices were used (table 2). 

 From October 25, 1962, to November 14, 1962, approximately 80 percent of the commercial 

 timber was removed from the study area. Standard post logging erosion control measures, 

 including water bars and grass seeding, were installed on the jammer roads. Postlogging 

 measurements of sediment production were continued on schedule until September 21, 1967. 



Table 2 . --Jammer road construction on the study watersheds 









Area disturbed 







: Percent 



Watershed 



Road 



: Road 



: Fill 



Cut : 





Watershed 



: watershed 



No. 



length 



: tread 



: slope 



slope : 



Total 



area 



: disturbed 





Feet 







- - Acres- 







Percent 



1 



420 



0.21 



0.07 



0.15 



0.43 



1.80 



24 



2 



568 



.28 



.22 



.14 



.64 



3.50 



18 



3 



904 



. 38 



. 39 



.25 



1.02 



4.70 



22 



Total 



1 ,892 



.87 



.68 



.54 



2.09 



10.00 



21 



■1 



