Kids to camp at 2:00, wheels toward the trail by 3:15. Every time below is re-cut for a fast pace so you bank the hatchery view and the full Fire Tower loop with real daylight to spare.
Follow the posted yellow & brown arrows from the trailhead. However the arrows run the loop, the aim is the same: reach the CCC fire tower β the high point at roughly the midpoint β with fresh legs, so the second half is a rolling descent back to the car.
If a posted arrow ever disagrees with a map, trust the arrow β they're maintained on the ground. Stay on the arrowed loop; unmarked connectors (White Connector, others) branch off mid-trail and are the easy way to add accidental miles. Use the Fire Tower zoom button on the map above to trace the real loop line.
The map above carries every real trail line. Deer Leap is the short spur from the spring up to the hatchery overlook (steep steps, turn around at the top). River Trail runs flat along the water and crosses Hwy F once β watch for traffic. Fire Tower is the long climbing loop to the tower.
Missouri state parks are free β no day-use pass. Grab a paper trail map at the Nature Center if it's still open when you arrive; the loud pyrotechnic vulture deterrent near Campground 3 only runs ~8β10 AM, so it won't affect your afternoon.