Length 13.3 mi · Climbing 1430 ft
Like most EBMUD trails, the Briones Reservoir loop is quite scenic and offers more of a sense of remoteness than the typical East Bay park. Briones Reservoir is also one of the few EBMUD properties to have a substantial length of singletrack trail — about a quarter of the loop. Although the hike is long, most of it is on dirt roads and a lot of it is level, so it's relatively fast and undemanding for its length.
The loop has a nice progression of quintessentially East Bay environments: the trail first climbs up into the hills, where there's almost no tree cover; then it follows the shore of the reservoir, a mostly flat stretch of trail that's partially under oak woods; and finally it climbs into the dense, shady woods on the south side of the reservoir.
A $10.00 annual permit is required to use this trail. The permit can be purchased online and printed out on your printer.
The first mile or so of the hike is the least scenic part. The dry, dusty dirt roads around the dam are used by trucks to maintain the dam and have a somewhat industrial look. Although the trail leaves these roads behind as it climbs into the hills, for a while the trail follows some less-than-scenic sets of electrical lines.
The scenery gradually improves, though, as the trail climbs to views over the reservoir and a brief glimpse of San Pablo Bay to the north. The trail then descends, passing through a wooded area before reaching the shore of the glittering reservoir.
The next few miles is the best part of the hike. Hugging the reedy shore, the trail passes through oak woods and grassy fields. This part of the trail is mostly level, although as it approaches the Bear Creek Road staging area there are a series of up-and-down undulations.
After the Bear Creek Staging Area the trail briefly passes through dense woods, then emerges onto a disused paved road. The road is flat and straight, running toward the reservoir and then along the shore. Although there are some glimpses of the reservoir, it's mostly hidden by the trees.
The road changes into a singletrack trail that dives into the woods and begins to climb. At first the woods are dense and dark bay laurel stands, but as the trail climbs it gradually changes to brighter stands of oak. There's also a lot of poison oak here, although the trail is well-used and generally clear.
The trail runs alongside Bear Creek Road for a bit but eventually dives back into the woods. It crests at a viewpoint where there are two benches within a pure stand of oaks. Although the view of the reservoir is limited by the trees, this point makes a nice short hike from the parking lot and seems to be the reservoir's most popular destination.
The woods aren't as dense and the scenery isn't quite as nice as the trail descends back to the parking lot, but there are some nice views of the reservoir.
© 2012, 2013 David Baselt