Contra Loma Reservoir–Acorn Trail, 6 sights is a 7.5-mile out-and-back in Black Diamond Mines Regional Preserve near Antioch, CA. The route reaches Contra Loma Reservoir. It climbs 1,268 ft, with sections as steep as 16% grade. It scores 41/100 on the Ambleway Wildness scale: green fringe.
Elevation
Getting there
Directions
Contra Loma Reservoir–Acorn Trail, 6 sights
7.5 mi · ▲ 1,268 ft · 3 hr 8 min
Elevation 215–1,137 ft
Out & Back · Black Diamond Mines Regional Preserve
Trailhead: 37.97744, -121.82668
Weather Aug 4: Clear, high 96°F / low 65° · precip 0% · wind 8 mph · sunrise 6:14 AM · sunset 8:15 PM
Transit-accessible: James Donlon Boulevard & Contra Loma Boulevard stop 526 m from the trailhead
- Start at the trailhead, heading SW.
- 50 ftPass Contra Loma Reservoir.
- 0.7 miTurn right, heading SW.
- 200 ftBear left, heading S.
- 0.5 miTurn right, heading SE.
- 0.2 miContinue straight onto Old Homestead Loop Trail, heading W.
- 1.2 miContinue straight onto North Portal Trail, heading W.
- 50 ftTurn right onto Old Homestead Loop Trail, heading SW.
- 0.3 miSharp left onto Acorn Trail, heading N.
- 0.4 miTurn left onto Ridge Trail, heading S.
- 0.9 miSharp left onto Contra Loma Trail, heading SE.
- 1.2 miBear left onto Stewartville Trail, heading E.
- 0.3 miTurn left onto Homestead Trail, heading N.
- 0.3 miSharp right, heading W.
- 0.2 miTurn left, heading E.
- 0.5 miBear right, heading NW.
- 150 ftTurn left, heading N.
- 0.7 miArrive back at the trailhead.
Each distance is the walk from the previous step. Tap a step for a map of its junction.
Trail surface
Weather
Sunset
The best sunset spot on this hike is 0.0 mi in (~1 min). Leave by 7:53 PM for the 8:15 PM sunset. Back at your car by 8:31 PM — 12 min before dark. Trailhead visible from the viewpoint
Good to know
- Transit-accessible: James Donlon Boulevard & Contra Loma Boulevard stop 526 m from the trailhead
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