These fish have larger scales than trout and still possess an adipose fin (small flap of skin on their back, toward the tail). Each fall, the mountain whitefish instinctively head upriver and into tributaries—seeking prime gravel bars for spawning. The spaces throughout the gravel provide a protected environment for their young, helping to ensure their survival.

If you visit the Grizzly Creek rest stop (off of I-70, in the Glenwood Canyon) in the fall, you can spot mountain whitefish congregating at the base of the small water falls where Grizzly Creek enters the Colorado River. You may also see their fins breaking the surface of small pools. Although it is easy to see the fish through the water, it’s intriguing to see them from another perspective—underwater!

The video clip on this page provides that underwater perspective, showing mountain whitefish making their way upstream to spawn!

Note: Even though it is legal to fish for mountain whitefish, all fishing is prohibited from March 15 through May 15, and from October 1 through November 30

• on Grizzly Creek for 1/2 mile upstream of the Colorado River, and
• on the Colorado River, 50 yards upstream and downstream from the confluence with Grizzly Creek.

As with viewing any other wildlife species, please watch these fish from a distance—and do not enter the tributary, even if you are not fishing.