We live less than 2/10 mile from this trail, near Sommersville Road in Antioch.For review purposes there are four distinct parts of this trail
Starting from the east end, where this trail meets up with the Marsh creek trail this trail is good, though better signage would be appreceated, west to Highway 4. It is very flat and some is travelling on rural Delta roads with typical Delta farmland and rural residential land scenery. Going east from there one crosses under the highway and begins a VERY steep, a climb of about a hundred feet in less than 3/4 mile, next to the Antioch water plant with very boring scenery - which you won't notice because you will be working hard unless you stop and look back.On most clear days you will see all the way to the Sierra Nevadas. At the top of the climb, you enter a residential area and then start downhill along the canal. The canal is on one side of the trail, which is in a pleasantly naturally landscaped strip behind homes. This is a pleasant slightly downhill ride, with a few road crossings, al the way to Somersville Road, a little over 6 miles. Then south along Somersville a short distance to where the trail begins again going west in an EBMUD right of way. There are steep rises and down slopes in this area, no natural or other landscaping, and behind houses. It is in this 9 mile stretch that there has been a couple muggings and a police officer killed in the last couple decades. At the west end of that stretch you navigate on residential streets with little signage telling where the trail is. Plan on taking some time to find your way through the first time. Then the trail begins the steep passage next to Highway 4 over Willow Pass. The trail here is good, though steep, and separated from the highway by a concrete block wall. Once over the top it is a steep descent into Concord. But be careful because at the bottom of the descent is a cross road with traffic. You can't take advantage of the speed coasting down the hill, easily 20+ mph, to coast a way because of the traffic possibilities. This is the west end of the Delta DeAnza trail. I've only ridden it on my trike once - on the way to a doctor's appointment at Kaiser Martinez. I recommend the Delta DeAnza trail from the Marsh Creek Trail westerly to Somersville Road. OK with care and keeping aware of your surroundings from Somersville to Bailey Road. And as a fitness exercise (or if necessary) from Bailey Road over Willow Pass.