From a park watch reporter: "A large tree is blocking the Pioneer Express trail as you travel towards Avery Pond, not far past the parking lot. We cleared as much as we could and my horse could jump over it on the down side, but as you can see from the photos, the trail is essentially blocked for horses unless you want to jump. A hiker can duck under. Also, since many of you hike and ride your horses on this trail because it is limited and no bikes are allowed, be aware there may be some bikers flouting the rules because fewer Rangers are on the trails."