As I passed Urrutia pond and was thinking about the new Bald Eagle nest nearby I came to an abrupt stop. A very large and nearly flat turtle was in the middle of the paved trail. It's not uncommon to find a turtle out like this probably searching for an upland area to lay eggs or maybe returning afterwards. This was something different. The turtle was much larger than our native Pond turtles or introduced Sliders. Its smooth shiny shell had a row of bumps around the edge and the face ended with long and pointed snout. Another rider stopped and livestreamed the turtle back his family.
I recognized the turtle as a nonnative softshell and probably the Texas Spiny Softshell which is native to the SW and Mexico but was introduced into irrigation canals in southern California years ago. It seems to be spreading northward but it's not clear if the species is becoming established or being moved around. The vegetation was thick on both sides of the trail bordered by Steelhead Creek on the north and Urrutia pond on the south. We decided it wasn't a good idea to leave it there and moved it a short distance til open water access was available. The turtle seemed no worse for wear and hitched a free ride. It was last seen diving into Steelhead Creek. At this point we don't know much about how this species interacts with native wildlife in the area. The observation has been added to iNaturalist where it can be shared with other biologists and researchers.