One tributary of Deer Creek is a natural spring that flows down the mountain, meeting up with more and more springs to finally flow as a small creek. The source of this spring has been piped and you should make a journey to the source just to fill up your water bottles. The stream flows, and picks up more water, at Cascade Springs, which fishing in would lead to a citation. Downstream from Cascade Springs are plenty of pull-outs for camping and fishing.
To get to Cascade Springs you can either start in Midway, Utah and travel West on Cascade Springs road. The road will lead right to Cascade Springs at which point you can continue on the road over to American Fork Canyon on the Alpine Loop or travel upstream to Little Deer Creek Campground. From Highland, Utah take the Alpine Loop road and take the turn for Cascade Springs.
The stream down from Cascade Springs follows pretty close to the road. Unfortunately, the creek can fall rather quickly compared to the road and it might be a hike to get to the water. The entire length of the road travels through the National Forest and is (not) maintained by that governmental agency. Be careful driving down the road, it can get narrow and rough in places, but we have seen sedans down that road but would not recommend it. There are many non--designated camping sites that have been created down the canyon, all of which are beautiful.
The landscape through the canyon is a striking example of the greater Utah ecosystem. The hillsides are lined with scrub oak and sagebrush, a harsh environment. However, along the path of the creek is an oasis of lush, green vegetation, willows, wildflowers, and more survive along the bank.
There are fish everywhere along this stream, getting to them before they see you though is the greatest challenge. The water is crystal clear, even during runoff, and as you go to toss a fly out you see fish swimming as fast as possible away from you. Stay low and away from the bank as much as possible and your chances for success will drastically increase. In places the creek will run more than ten feet wide and in others it may be small enough that with a good jump you can cross it without getting wet. Wild browns call the stream home and from the size of the stream be surprised for some relatively big fish, pulling out a 14" brown is not unheard of. It is for that reason we don’t fish the creek with anything smaller than a 3 wt.
For a stream that does not get a lot of pressure from fly-fishermen, the fish here can be characterized as snobby. They will take standard patterns readily, but be prepared to watch as they quickly turn off to what you're offering. Standard midge, mayfly, and caddis patterns work well. During the late summer and fall ants, hoppers, and beetles work wonders. The best kept secret: if the fishing dies down for you, take a break with a good book and sit on the bank for ten or fifteen minutes and then get back to it. That short amount of time will more than likely give the fish time to relax again.
While fishing, be prepared, and a bit cautious, you never know what you might run into. Moose call Deer Creek home and for being as large as they are, are more than capable of hiding in the willows until you stumble upon them. Mule deer also call the canyon home and will more than likely dot the fields, meadows, and hillsides as you drive to each fishing hole.
Deer Creek is a small stream that will make you work hard to find a fishing hole that is more productive at catching fish than losing flies, but once you find that secret spot don't let it out of the bag. As always, Good Luck and Guid Luck