Environmental Assessment

AFFECTED ENVIRONMENT & ENVIRONMENTAL CONSEQUENCES CHAPTER 3
White-headed woodpecker
(WHWO)
0.3 0.5 2 2 4 4
Williamson’s sapsucker (WISA)
Current Direction for the
14 3 28 9 50 17
Ponderosa Pine 58
Current Direction for Mixed
3
1
Conifer 58
5-9
4
American marten (AMMA) 12 4 13 4 14 4.5
Current Direction for LP 58 6 N / A
Line transect surveys were conducted to determine snag and down log levels in two of the five sub-areas
within the planning; the Pine Mountain and Tepee Draw WRHUs. The Pine Mountain WRHU was
further subdivided into two (2) parts; the OGMA and other (the area outside the OGMA). The remaining
areas were assessed using silvicultural stand exam data. This data was not augmented by data from
outside of the planning area boundaries because the minimum size of the assessment area recommended
by DecAID (20 square miles) is exceeded by the size of the planning area (approximately 85.3 square
miles).
Table 3-50 summarizes the results of the line transect surveys in the Pine Mountain and Tepee Draw
WRHUs. Table 3-50 summarizes the results of the analysis using stand exam information.
Table 3-50 Summary of Snag and Down Log Transects in the Pine Mountain and Tepee Draw WRHUs
Sub-Area
Snag Diameter Classes Log Decay Classes
(average number / ac.)
59 (average
number / ac.)
10"- 16"- >20" 1 2 3
15" 20"
3-159
Samples (# of
transects / total
acres)
Pine Mt.-
OGMA
.23 .69 .92 4.00 3.15 17.7 13 trans. / 48 acres
Pine Mt.-
Other
.22 .33 .78 6.22 10.89 18.56 9 trans. / 52 acres
Tepee Draw .50 .33 .50 2.42 1.58 22.42 12 trans. / 59 acres
Composite
Averages
1.5 snags / ac. (range 1.33-1.84) 28.98 logs / ac. (range 24.85-35.67)
Table 3-51 Stand Exam Plot Snag Summary, Lavacicle, Mahogany and Potholes WRHUs
Tree Species
Snags per Acre (average) by Diameter Class
Number of Stands /
Acres Inventoried 10"-14.9" 15"-19.9"
20 inches and
greater
Ponderosa pine 20 stands / 1,369 acres .3 snag / ac. .14 snag /
ac.
.5 snag / ac.
Lodgepole pine 26 stands / 1,481 acres .56 snag / ac. .23 snag /
ac.
.08 snag / ac.
Totals: 46 stands / 2,850 acres PP total all sizes = .94 snag / ac., LPP total all sizes = .87
snag / ac.
Both analyses determined that current snag levels are below desired conditions. Data from the transect
surveys suggest that the levels of down logs appear to be acceptable in the two WRHUs surveyed. No
58 Current Direction (Eastside Screens) is provided by habitat type and densities greater than 10 inches and greater than 20 inches.
It is not broken down into tolerance levels but rather represents a 100% biological potential. Rose, as cited by the Wildlife Report
(page 15), determined this to be a flawed technique.
59 Log decay classes: 1 = intact, all of bark, with limbs, mostly suspended; 2 = intact to partly soft, all of bark, some limbs, partially
suspended; 3 = hard, large pieces, little bark, no limbs, near ground.