COMMISSION

County provides trail maintenance for 21 miles of OHV routes on the Mount Hough
Trail System and 183 miles of Plumas County OHV routes.
•§
Clay Pit SVRA – As part of the Clay Pit SVRA Drainage Improvement Project, park
staff constructed two elevated water crossings that improve user access to the site,
control storm water, and help protect water quality downstream. Throughout the
process staff worked closely with state and federal regulatory agencies to limit and
mitigate project impacts to the federally threatened Vernal Pool Fairy Shrimp.
Heavy equipment operators installing
the culvert
Culvert in the Drainage Management Area
•§
Over the last five years, Hollister Hills SVRA partnered with faculty and students
from California State University (CSU) Monterey Bay’s Division of Science and
Environmental Policy to establish a water quality monitoring program at the park.
The program measured the amount of sediment coming in and out of the park’s
boundaries and attempted to parse out sediment sources and their input locations.
To accomplish this, the program conducted a variety of monitoring studies that
examined either watershed processes or the changes over time to man-made
features.
These studies determined the general nature of the park’s watersheds and included
the measurement of landslide complex movement rates, measurement of stream
bank erosion rates, and surveys of the longitudinal or cross-sectional profiles
of streambeds. Study examples focused on how trails form and how sediment
detention basins were introduced to the landscape and how these changed over
time. These included trail erosion studies to help calibrate the trail assessment rating
system, and sediment basin profile surveys using photogrammetry to measure the
amount of material captured and stored by the park’s sediment detention basins.
The result was a collection of monitoring studies that established a baseline that
environmental scientists could use for future monitoring and assessment efforts.
24
California State Parks, Off-Highway Motor Vehicle Recreation Commission