APPENDIX P
wheatgrass. Above Blitzen Crossing, moist meadows containing meadow foxtail, Kentucky bluegrass, and
sedges are interspersed with willows and alder along the river.
The Page Springs meadow area was assessed as having significant natural values. The meadow is a good
representative of a low-elevation riparian community.
Little Blitzen River: The
lower part of Little Blitzen River, below Riddle Brothers Ranch, is dominated by
black cottonwood, willow, and alder. Meadows containing Kentucky bluegrass, sedges, rushes, and cheatgrass
occur sporadically along the stream.
Vegetation within Riddle Brothers Ranch is mostly in the form of meadows, which have been altered by
irrigation
from a series of ditches. The meadows are made up of both native and cultivated nonnative species.
Native species include redtop, tufted hairgrass, Cusick’s bluegrass, and Nebraska sedge. Nonnative species
include timothy and Kentucky bluegrass. The riparian area that runs through Riddle Brothers Ranch is
dominated by black cottonwood, alder, and willow.
Upstream from Riddle Brothers Ranch in the steep lower part of Little Blitzen Gorge, the riparian area is still
dominated
by black cottonwood, alder, dogwood, willow, western juniper, chokecherry, and quaking aspen.
In the drier areas above the riparian area, juniper, mountain mahogany, and big sagebrush are the dominant
overstory species. The upper gorge contains large aspen groves in spring areas and along the stream with
mountain big sagebrush communities on drier bottoms and on gorge walls. The north facing walls of the
upper gorge contain gently sloping ledges with wet meadows. These meadows contain interesting plant
communities as well as several Special Status plant species.
The areas in this segment assessed as having significant unique natural values include Rooster Comb RNA/
ACEC, Little Blitzen RNA/ACEC, and the riparian/meadow complex at Riddle Brothers Ranch.
South Fork of the Donner und Blitzen River: V
egetation in the lower section of South Fork of Donner und
Blitzen River is dominated by basin big sagebrush, juniper, and Idaho fescue on side slopes with alder, willow,
chokecherry, and currant along the stream. This area is considered to have unique natural values because of
the canyon riparian vegetation. Farther upstream, the canyon widens into a broad basin dominated by large
meadows in the bottom and willows along the stream. Meadows are dominated by native species such as
meadow barley, mannagrass, tufted hairgrass, Nebraska sedge, woolly sedge, and rushes. The headwaters
area is privately owned but the springs and meadows are important because they represent a mix of low- and
high-elevation springs and meadows.
Areas containing unique natural values include the river canyon between Blitzen Crossing and the confluence
with Mud Creek; the small stream, aspen grove, and meadow at Huffman Camp; and the headwaters of South
Fork of Donner und Blitzen River.
Big Indian Creek: The
lower part of Big Indian Creek contains a narrow band of riparian area dominated by
alder, dogwood, and willows. Upland areas contain juniper, mountain mahogany, and mountain big sagebrush
with an understory of Idaho fescue and bluebunch wheatgrass. Mountain mahogany increases in the uplands
of the lower part of Big Indian Gorge. As the riparian bottom becomes wider, black cottonwood, aspen,
and willow are the dominant species. The uplands are still dominated by mountain big sagebrush with an
understory of needlegrass and Idaho fescue.
Near the headwall, the riparian area is dominated by willows and wet meadows containing sedges, tufted
hair
grass, alpine timothy, bistort, moonworts, owl clover, and gentians. The cirques at the head of the gorge
contain alpine ponds and many Special Status plant species.
Within Big Indian Gorge, unique natural areas of particular interest include mountain mahogany stands near
the bend in the gorge, headwater meadows, and the upper cirque.
Little Indian Creek: Little
Indian Creek contains some of the most diverse riparian area in the entire river
corridor. The narrow lower part of the canyon contains alder, birch, black cottonwood, chokecherry, dogwood,
serviceberry, and hawthorn. As the canyon widens in the middle part of the segment, the riparian area is
P – 33