Waker -
The ponds you were looking at are the Forston Mill Ponds; south of the old railroad grade. They are old ponds from the days the mill was active. The Whitehorse steelhead rearing ponds are on the north side of the railroad grade and is found several hundred yards upstream on the creek that enters the top end of the Forston Hole.

A large number of coho (all wild) use the Fortson Ponds; it is not uncommon to see hundreds of coho spawning in the creek between the two ponds (especially around Thanksgiving). WDFW doesn't raise coho at Whitehorse though the ponds are used for short term rearing of the supplemental chinook (from wild brod stock) raised
by the Stillaguamish Tribe.

Tight Lines
Smalma