Watershed A
AREA: ???? ac ( ha)
SLOPE:
ASPECT: Southeast facing
ELEVATION: 5,??? to 5,??? ft (1,??? to 1,??? m)
VEGETATION: Chaparral—Dominant shrubs are shrub live oak,
birchleaf mountainmahogany, sugar sumac, and Emory oak
PARENT MATERIAL: Course Granite
GAGE: 120°V-notch weir
PERIOD OF RECORD: 1956 (partial) through 19??
HISTORY: This is one of the Three Bar watersheds located
west of Lake Roosevelt in the Three Bar Wildlife Area, which is
maintained cattle-free for game management studies. Stream and rain
gages were installed in 1956. Streams were intermittent, flowing
about one-third of the time during the first 3 years (1956-1059),
and yielding less than 1 inch per year average flow (Hibbert et
al 1974). The Boulder wildfire swept over the area in June 1959,
topkilling all shrubs (Glendening et al. 1961).
OBJECTIVE: To determine how converting chaparral vegetation
to grass affects streamflow, erosion and sedimentation, vegetation,
and wildlife.
TREATMENT: Watershed A was shut down in ???? and no further
records were collected.
SELECTED REFERENCES
Glendening, G. E., C. P. Pase, and P. Ingebo. 1961. Preliminary
hydrologic effects of wildfire in chaparral. Arizona Watershed Symposium,
Proceedings 5:12-15.
Hibbert, A.R.; Davis, E.A.; Scholl, D.G. 1974. Chaparral conversion.
Part I: Water yield response and effects on other resources. USDA
Forest Service Research Paper RM-17, 36 p. Rocky Mountain Forest
and Range Experiment Station, Fort Collins, CO.
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