Project Information Sheet
Trail 12 (Mapache Trail)
Jasper Ridge Biological Preserve
Background: The Mapache Trail is
part of a network of trails in the preserve, one
which is used by both researchers and docent-led
groups. The trail skirts a silted-up area near
Searsville Lake, and actually passes through a number
of areas which are wet or are underwater through
portions of the winter. The largest wet area contains
a great many willows which tend to overtake the trail
or fall onto the trail, thereby necessitating a great
deal of maintenance each year. The swampy area is the
site of important bird counts, so access must be
retained, but the project will move the trail uphill
and out of the wet area.
Description: The project consists of four
separate sections (from north to south):
1. Approx. 150 ft. Reroute moves creek
crossing upstream to avoid ponding and to decrease
grade on either side of creek. Extensive brushing
through poison oak. Small bridge or culvert may be
2. Approx. 50 ft. Reroute uphill to avoid
ponding in current location. Little brushing
required. French drain or culvert may be installed
where reroute crosses a small slump.
3. Approx. 300 ft. Reroute moves creek
crossing upstream. Moderate brushing required (some
poison oak). No switchbacks. Some rock. Bridge will
be constructed later.
4. Approx. 1100 ft. Reroute uphill to avoid
swampy area. Heavy chaparral, some poison oak on
hillside; willows in wet area. Route follows old
fence line; fence posts must not be disturbed (wires
can be cut). 1 switchback. Long bridge to be
Width: 3 ft.
Outslope: 2-3% (standard)
Flagging: At grade level
Other Considerations: poison oak, wasps
(possible), old fence posts, woodrat dens (should not
be disturbed if possible due to new Hantavirus
Number of Workdays: 5-6
Worksite: Gate locked at all times; entry
possible only at designated time or by special
arrangment. Gate will permit exit at any time. Access
to preserve at other times available only by
arrangment and in the company of docents.
Restrooms, Picnic Area: Docent Center
Emergency: 911 from phones at Docent Center
and at Main Gate
Hospital: Stanford Hospital. Leave Main
Gate, turn right and travel approx. 3.5 mi. east on
Sand Hill Rd. to Pasteur Drive. Follow signs to
Trail Center. All rights reserved.
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Manager for corrections or comments.