| 1986 | 1995 | 1999 |
| Wyandotte Lake | Wyandotte Lake | Stage-Stop Campground |
| Wyandotte Riffles | Wyandotte Riffles | White Cloud |
| Above Harrison Springs | White Cloud | Above Harrison Springs |
| 1 mile below Rothrock's Mill* | Above Harrison Springs | Rothrock's Mill |
| - | Rothrock's Mill | Milltown |
| - | - | Fredericksburg |
| - | - | Below Beck's Mill |
* Collection site was moved downstream because the dam at this site had recently been demolished.