I am so torn, I love this river and its trails...spent my whole summer here running and training, but the river itself is downright nasty.
At the location I go to run, there are two places to park. The one closer to the exit is for running, while the other is for kayaking, though there is a trail too. This trail is untamed. I would excise caution when running here, it's more like hiking. My friend got stung by a bee a year ago and still has a purple scar/bruise the size of a fist on his legs.
I would pay the parking fees ($3), and better yet buy the annual pass for $25, as they do check if you have one or not.
In the trail designated for exercising, there is a restroom and a nearby water fountain + dog bowls in the middle of the trail in a gazebo looking structure. Gravel dominates 1/3 of the trail, soft soil on the next 1/3 (shaded, and great for runners to absorb the impact instead of too much on the knees), and harder, drier, and more compact soil on the next 1/3 of the trail (this part has no shade and is brutal during summer).
Don't be surprised if people pop out of nowhere, as there are many trails leading to and from this trail.
Creatures you can see here are: great blue heron, trout, other fishies, ducks of all kinds, snakes, little birds, pelican-looking birds, lizards, huge insects....of course dogs with owners are here too...it's like a zoo, there are so many dogs here!
I once did a science project on the water at the river; more specifically, did a Winogradsky column with water and soil from the area. There are plenty of common river protists in the water, but we didn't see anything dangerous. The bacteria we extracted from the Winogradsky weren't anything too out of the extraordinary either. read more