Black Diamond Mines Regional Preserve
Contra Loma Reservoir–Acorn Trail, 5 sights
7.8 mi · ▲ 1,354 ft · 3 hr 17 min
Contra Loma Reservoir–Acorn Trail, 5 sights is a 7.8-mile out-and-back in Black Diamond Mines Regional Preserve near Antioch, CA. The route reaches Contra Loma Reservoir. It climbs 1,354 ft. It scores 32/100 on the Ambleway Wildness scale: green fringe.
Elevation
Getting there
Directions
Contra Loma Reservoir–Acorn Trail, 5 sights
7.8 mi · ▲ 1,354 ft · 3 hr 17 min
Elevation 135–1,137 ft
Out & Back · Black Diamond Mines Regional Preserve
Trailhead: 37.97951, -121.82202
Weather Aug 4: Clear, high 97°F / low 66° · precip 0% · wind 10 mph · sunrise 6:13 AM · sunset 8:16 PM
Transit-accessible: James Donlon Boulevard & Blythe Drive stop 135 m from the trailhead
- Start at the trailhead, heading S.
- 0.2 miContinue straight onto West Shore Trail, heading W.
- 50 ftPass Contra Loma Reservoir.
- 0.4 miTurn left, heading SW.
- 0.5 miTurn right, heading S.
- 150 ftBear left, heading SW.
- 0.5 miTurn right, heading SE.
- 0.2 miContinue straight onto Old Homestead Loop Trail, heading SW.
- 1.2 miContinue straight onto North Portal Trail, heading W.
- 50 ftTurn right onto Old Homestead Loop Trail, heading W.
- 0.3 miSharp left onto Acorn Trail, heading N.
- 0.4 miTurn left onto Ridge Trail, heading SW.
- 0.1 miReach Contra Loma Reservoir, then turn around and head back the way you came.
- 500 ftTurn right onto Acorn Trail, heading E.
- 0.4 miSharp right onto Old Homestead Loop Trail, heading NE.
- 0.3 miTurn left onto North Portal Trail, heading E.
- 50 ftContinue straight onto Old Homestead Loop Trail, heading E.
- 1.4 miTurn left, heading E.
- 0.5 miBear right, heading NW.
- 150 ftTurn left, heading N.
- 0.5 miTurn right, heading E.
- 250 ftContinue straight onto West Shore Trail, heading E.
- 0.6 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 0.8 mi in (~25 min). Leave by 7:31 PM for the 8:16 PM sunset. Back at your car by 8:50 PM, after dark — bring a headlamp.
Good to know
- Transit-accessible: James Donlon Boulevard & Blythe Drive stop 135 m from the trailhead
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