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

0 mi135 – 1,135 ft8.0 mi

Getting there

Trailhead: Unnamed 37.97951, -121.82202
Nearest town Antioch, CA

Directions

AMBLEWAYwww.ambleway.com

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

  1. Start at the trailhead, heading S.
  2. 0.2 miContinue straight onto West Shore Trail, heading W.
  3. 50 ftPass Contra Loma Reservoir.
  4. 0.4 miTurn left, heading SW.
  5. 0.5 miTurn right, heading S.
  6. 150 ftBear left, heading SW.
  7. 0.5 miTurn right, heading SE.
  8. 0.2 miContinue straight onto Old Homestead Loop Trail, heading SW.
  9. 1.2 miContinue straight onto North Portal Trail, heading W.
  10. 50 ftTurn right onto Old Homestead Loop Trail, heading W.
  11. 0.3 miSharp left onto Acorn Trail, heading N.
  12. 0.4 miTurn left onto Ridge Trail, heading SW.
  13. 0.1 miReach Contra Loma Reservoir, then turn around and head back the way you came.
  14. 500 ftTurn right onto Acorn Trail, heading E.
  15. 0.4 miSharp right onto Old Homestead Loop Trail, heading NE.
  16. 0.3 miTurn left onto North Portal Trail, heading E.
  17. 50 ftContinue straight onto Old Homestead Loop Trail, heading E.
  18. 1.4 miTurn left, heading E.
  19. 0.5 miBear right, heading NW.
  20. 150 ftTurn left, heading N.
  21. 0.5 miTurn right, heading E.
  22. 250 ftContinue straight onto West Shore Trail, heading E.
  23. 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

38% gravel27% dirt5% paved30% unspecified

Weather

ClearTemperature 97°F66°
Feels like79°Precip0%Wind10 mphUV8Humidity22%
Hourly temperature
100°65°
Sunrise 6:13 AM12 AM3 AM9 AM12 PM3 PM6 PMSunset 8:16 PM
Wed 94°60°
Thu 99°65°
Fri 104°69°
Sat 103°68°
Sun 100°67°
Mon 97°64°

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.

More sunset hikes nearby

Good to know

  • Transit-accessible: James Donlon Boulevard & Blythe Drive stop 135 m from the trailhead

Other ways to reach this destination