ACTIVITIES 55 



over by the Bureau of Fisheries. During the 1920 season 

 2,000,000 trout and grayling fry from the Yellowstone hatch- 

 eries were planted in the park waters. The Glacier hatchery 

 planted 1,500,000 in Glacier Park. 



Improvement. The Civil Engineering Section of the Serv- 

 ice is charged with the planning of all road and trail extensions 

 in the parks, as well as with the formulation of plans for all 

 general engineering projects. Under the general supervision 

 and control of this department the work of extending the 

 roads and trails in the several parks is constantly going for- 

 ward, depending upon the funds available for construction 

 purposes. 



The construction of bridges and culverts is also handled 

 by this section, as are the preparation, and the equipment with 

 conveniences, of camping and automobile parking sites. Other 

 important activities of this section are the preparation of 

 standard designs for such things as log bridges, timber and 

 corrugated metal culverts of various sizes, and concrete arch 

 culverts of standard widths. Standard specifications are also 

 prepared for the purchasing of all Sorts of construction equip- 

 ment and miscellaneous supplies and tools. Drawings are 

 prepared for standard ranger cabins and administrative build- 

 ings ; plans and estimates of proposed work in different parks 

 are reviewed, and engineering studies are made of the prob- 

 lems confronting the several parks in improvement matters. 



In the prosecution of all its improvement activities the Serv- 

 ice endeavors, through its Section of Landscape Engineering, 

 to make each improvement undertaken blend harmoniously into 

 a carefully considered scheme, in order to secure a maximum 

 of beauty and convenience with a minimum of interference 

 with natural conditions. This scheme is had in mind in the 

 planning of vista cuttings, the removal of dead and down 

 timber, the location of trails, roads, and bridges, and the lo- 

 cation and construction of buildings for the administrative 

 and cooperative units of the parks. It is an invariable rule 



