Tinker's Dam was a dam located somewhere in Tumbleweed Valley. It first appeared in the Riders Radio Theater album, and carried over into the actual radio program where it was first mentioned in Meltdown on the Mesa 101 and first "appeared" in Meltdown 112. It was destroyed by Ranger Doug's Number One Yodel in Meltdown 112.
- Size Across: Quarter Mile
- Size From Top To Bottom: Mile
- 800 Feet Deep
- Holds 30 Million Gallons of Water
- The name "Tinker's Dam" is a reference to the idiom "Not worth a Tinker's Damn".