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III IIIIIIIIIIIIIIII ~ <br />United States Department of the Interior <br />FISH AND WILDLIFE SERVICE <br />NATIONAL ECOLOGY RESEARCH CENTER <br />4512 McMurry Avenue <br />Fort Collins, Colorado 80525-3400 <br />September 25, 1991 <br />In Reply Refer To: ~,,; ~'' <br />FWS/Region 8/NERC <br />Robert Baldwin, President <br />West Arapaho Soil Conservation District <br />730 Simms Street, Suite 416 <br />Golden, CO 80401 <br />Dear Mr. Baldwin: <br />ir7 i' <br />TAI~~ ~ <br />r_~ <br />AMERICA <br />~~ <br />r_~ <br />~~~ <br />_ ~ <br />~ ~ <br />RWEB: 516.03d ,. <br />6130.W123 <br />t]~ L-. <br />1~ .. ,.,. <br />i <br />This letter serves as a record of expenditures and progress report of our work <br />at the Coal Creek site through September 25, 1991. <br />Progress Report: We have continued monitoring the fifteen wells, with depths- <br />to-water being taken every 2-4 weeks. In addition, we have continued <br />monitoring the crest-stage gages. 7o date, we have recorded seven flow <br />events. <br />We have completed surveying of the hydraulic cross-sections and the transect <br />belts which are 150 meters wide except for the belt at transect 4. This belt <br />is 120 meters wide due to hinderance of certain geographic features. These <br />belts are divided into "cells" based on stream geomorphology (See attachment 3 <br />from previous report, 3une 25, 1991}. Remaining surveying includes traverse <br />surveying to tie the four transects together and referencing them to known <br />benchmarks. <br />Tree-tagging has been completed with a total number of 732 trees in the four <br />transect belts. The trees were numbered according to the cell into which the <br />trees fell. <br />We have also completed crown vigor assessment for all 732 trees. The vigor <br />assessment was based on a percentage of a 100% full crown for each individual <br />tree; no 100% trees were found. These trees will be divided into classes <br />based on their vigor assessment. In addition, we have begun to take <br />measurem~ants of tree diameter at breast height (DBH). To date, we have <br />measured 102 trees and we hope to complete DBH measurements by the end of <br />fiscal year 1991 (Attachment 1). We will continue to monitor the crown vigor <br />and DBH of the trees to determine if they improve or deteriorate through time. <br /> <br />Finally, we have installed eight vegetation exclosure plots. These exclosures <br />will give us an idea of natural cottonwood regeneration in the absence of <br />cattle grazing. These exclosure plots are five meters square; half of the <br />