About the Forest
About the Forest
Andrews Watershed 9 - WS09
Andrews Experimental Forest (HJA)
Watershed above the Watershed 9 gaging station
Bounding Coordinates (decimal degrees):
Slope (%): 58.36
Aspect (degrees): 211
Undisturbed control. WS#9 serves as the control for WS#10. WS#9 is located just south of the mouth of Lookout Creek along the Blue River Reservoir.
Soils are largely weathered to reddish brown latosols, in tuff and breccia parent materials. Although the parent rock may be weathered to great depths, soil horizonation is only weakly developed.
Little geologic analysis has been conducted in Watershed 9. Because Watershed 9 and Watershed 1 of Lookout Creek Watershed are adjacent, it is reasonable to assume Watershed 9 bedrock is similar to that occupying similar elevations (425 m and 700 m) in Watershed 1. Lower elevation areas (i.e., < 600 m) in Watershed 1 are dominated by reddish and buff-colored Little Butte tuffs and breccias. Sardine greenish tuffs and breccias dominate middle elevation (from approximately 600 m to 900 m) bedrock in Watershed 1. Rock outcrops are numerous in Watershed 9.
Gauged watershed area: 8.5 ha (original surveyed value used in rating equation calculations)
No comprehensive vegetation survey has been conducted for Watershed 9. Vegetation in Reference Stand 8 (located in Watershed 9) has a partially open canopy dominated by old-growth (> 250 years) Douglas-fir with an understory of emergent Douglas-fir, western hemlock, Pacific yew (Taxus brevifolia), and bigleaf maple (Acer macrophyllum) (Hawk et al. 1978).
Typically, snow begins falling in November with peak snow water equivalent storage estimated to occur in Feb-April. Transient snow zone with <25% precip falling as snow at lowest elevations.