Eighteen years ago this
month, in 1997, Yosemite Valley experienced a 100-year flood. Warm rain melted
the snowpack in the high country and all that water flowed into the valley. The
damage was so great to the roads and infrastructure that the valley was closed
for several months. When minimal facilities were restored and I could get in, I
hiked the seven-mile length of the valley, going from the east end by Half Dome
to the west, surveying the damage and hoping that the places I loved have
survived.
The photo above is at Happy Isles, with trees knocked down and branches piled up on the far bank of the river.
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In Tenaya Canyon, the bridge
crossing Tenaya Creek above old Mirror Lake is gone, washed away like many of
the other footbridges in this area. I reach the other side by stepping across
boulders in the stream. The trail that went along the riverbank disappeared
with the riverbank. The tranquil spot by the river that had a reflection of
Half Dome overhead is gone.
In many places the water is
red-orange, which indicates the presence of iron. There is an actual "Iron
Spring" below the lower pool of Mirror Lake that colors the water there,
but this coloring is new since the flood and starts just below where Snow Creek
joins in. The pine trees in the middle section of Tenaya's landscape are dying,
whether this is due to the change in the river's route, damage from the flood,
the new presence of iron in the water, an infestation of insects made possible
by the environmental changes, or all of the above.
Change one element in
nature and the effect ripples throughout the ecosystem.