Ascent of Zim Zim Ridge on 2021-04-05

Climber: Andrew Kirmse

Other People:Solo Ascent
Only Party on Mountain
Date:Monday, April 5, 2021
Ascent Type:Successful Summit Attained
Peak:Zim Zim Ridge
    Elevation:1801 ft / 548 m

Ascent Trip Report

These little peaks north of Lake Berryessa had long been on my list since they’re on public property in the Knoxville Wildlife Area. The whole area was closed after the 2020 fires, and after it reopened, there wasn’t much time before it got too hot to hike here. I drove up Knoxville-Berryessa Road over several concrete causeways, totally dry this time of year. There is a signed trailhead that leads to a dirt road that ascends only very gradually for about 2 miles. It crosses Zim Zim Creek -- currently a trickle -- several times. The USGS topo shows a 4WD trail up on a ridge, and I pushed through some burned chamise until I reached it. The old trail was overgrown before the fire, but it had been recently bulldozed again higher up. The bulldozer track switchbacked left up to the ridge and continued up to the summit.

Returning the same way back to the valley, I crossed the trail perpendicularly, crossed the dry creek, and started up the other side toward Peak 1720. This slope was also severely burned, but it’s grassier with only occasional patches of burned chamise and manzanita. The ridge itself appeared to have been bulldozed several years ago, and is slowly growing back. It was still easy enough to follow it to the summit. There I found David Sanger’s rock cairn, but the register inside had been incinerated, and I didn’t have a replacement. I continued along the firebreak all the way back to the car. The last section was quite a steep downhill, and it’s hot and unshaded.

Summary Total Data
    Total Elevation Gain:2351 ft / 716 m
    Total Elevation Loss:1260 ft / 384 m
    Route Conditions:
Maintained Trail, Open Country
Ascent Statistics
    Gain on way in:2351 ft / 716 m
        Gain Breakdown:Net: 1091 ft / 332 m; Extra: 1260 ft / 384m
    Loss on way in:1260 ft / 384 m
    Distance:8.5 mi / 13.7 km
    Start Trailhead:710 ft / 216 m
    Time:4 Hours 
Descent Statistics
GPS Data for Ascent/Trip

 GPS Waypoints - Hover or click to see name and lat/long
Peaks:  climbed and  unclimbed by Andrew Kirmse
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Note: GPS Tracks may not be accurate, and may not show the best route. Do not follow this route blindly. Conditions change frequently. Use of a GPS unit in the outdoors, even with a pre-loaded track, is no substitute for experience and good judgment. accepts NO responsibility or liability from use of this data.

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