The Greys River is located just east of the Idaho and Wyoming border where it flows for 45 miles into the Snake River above Palisades Reservoir near Alpine, Wyoming. The river is home to incredible fishing opportunities, with primary species consisting of cutthroat trout within its headwaters and cutthroats and brown trout in its middle and lower sections. It also supports some rainbow and brook trout. The most prime fishing begins just after runoff ends in June and continues into October. The Greys River is best fished by wading, although it is possible to fish from a drift boat in some areas. It has plenty of cutthroats ranging from 10 to 16 inches. Its lower section has some large brown trout. These large browns move out of Palisades Reservoir up into the river to spawn. In the spring, larger rainbow trout move out of the lake into the stream to spawn.
Beyond the river, the surrounding mountains and their many canyons offer horseback riding, hiking, and trophy elk and deer hunting, meriting many “Boon and Crockett records”.
The Greys River has several tributaries. One that is especially populated with cutthroat trout is the Little Grey River. It is also unique in respect to the absence of dams throughout its entire length. It is filled with boulders and pocket water from one end to the other. There is rarely any pressure on any particular stretch of water. The stream is lightly fished. If you are looking for a place to get away from the crowds, pick your own stretch of water and catch plenty of trout, the Greys River is certainly a place you can do that. Dry fly fishing can be exceptional on the Greys River.
The Greys River also has an ample population of Snake River Fine Spotted Cutthroat trout. The average fish range from 12 to 14 inches, but during the spring spawn many larger fish come up from Palisades Reservoir. The Greys River is home to Caddis hatches and Golden Stones hatches after the water comes down in June. July brings Pale Morning Duns, Yellow Sallies and Grey Drake hatches. Around the beginning of August, grasshoppers become abundant and become the predominate food source. After it cools down in the fall there are abundant Blue Wing Olive hatches. Nymph fishermen will find the Greys a very productive fishery using the nymph stages of all the above mentioned flies. Matching the hatch is not critical on the Greys River.
The Salt River Range to the west and the Wyoming Range to the east both host several peaks that reach above 11,000 feet in elevation. The mountain valley is alive with the sweet smell of wildflowers; the green forest floor is shared with yellow Balsamroot, red Indian Paintbrush, Yellow Arrow-leaf, and purple Fireweed making it a picturesque setting for fly fishermen. Like many Wyoming Rivers the fishing season on the Greys River is influenced by spring runoff, so typically good fishing starts late in June when the river clears and continues into the fall. The river’s character offers some good undercut banks, pocket water, fallen timber and at times some very fast whitewater. In summer, the river’s flow can range from about 600 cubic feet per second up to 2,000 cubic feet per second.