Tully Lake is a US Army Corp of Engineers dam site.

There is a 1300 acre reservoir behind the dam. There are many recreational activities to be had here.

The best description of these is on the USACOE webpage.

Tully has a trail network that exceeds 8 miles. But connected trails in the area exceed 25 miles.

Some of the trails are scenic beside the water but many others are in heavilly wooded areas.

The trails are not easy, but not overly difficult.

You'll enjoy riding tully.  But don't escpect to ride all the trails in one day.