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Hopper Madness On Wyoming's North Platte River

By: Brian Endlich

Rich and I left the Corral Creek campground at 8 AM to make the 2 mile hike over the pass to Boulder Gap. It was late August and the crisp morning air would turn hot and windy by afternoon leading us to anticipate good hopper action later in the day. As we dropped down into the Gap we passed an old fire ring in an inviting campsite but no other fishermen appeared to be present. A pair of Golden Eagles carried out a mating ritual on the canyon's thermals high above the boulder from which the canyon derives its name. This huge boulder sits perched above one of the canyon's most productive pools.

It was about 9 AM when we arrived at the river, a trico spinner fall was beginning to wane and numerous trout were sipping spent flies. Many of the fish were rising tight to the bank and we spent an hour sight casting to rising fish and mostly putting them down. It is amazing how skittish trout are when sipping spinners, while the same trout that will smack caddis flies with wild abandon. It was a bright dear morning and as the air started to warm a sporadic mixed hatch of PMD's and small caddis began. As I walked upstream I discovered a deep pool which had several large rocks at the head that formed a complex series of current seams. A number of nice fish were rising steadily along the current seams. I tied on a size 16 CDC elk hair caddis as Rich, my
brother-in-law from California, went upstream to nymph a long riffle. I proceeded to work the pool with the caddis imitation and managed to hook and land several nice rainbows with the largest running about 16".

Close to noon a thunderstorm blew in with ferocious gusts of wind but shed little rain in my part of the canyon. I ducked back into the trees to get out of the brunt of the wind, taking care not to be dose to the tallest tree in the grove. An interesting feature of the monsoon season in Southeastern Wyoming, where the North Platte enters the state from its headwaters in the North Park region of Colorado, is that thunderstorms are quite scattered. It is very common to see a large thunderhead moving across the valley streaming with rain and lightning but completely surrounded by dear blue skies.

As the wind abated I was intently trying to entice a 12" rainbow that was giving me the "picky eater" routine, nearly bumping my fly with his nose then drifting away in obvious disdain. As I was tying on a 7X tippet and a size 20 caddis, Rich reappeared from upstream and asked why I was wasting my time on such a puny fish - displaying a Dave's hopper that had been chewed to the bare hook by a series of obviously large trout. He asked if I could spare any of my foam hoppers since all his deer hair ones had been thoroughly trashed. My favorite hopper imitation is a version I adapted from the hopper designed by noted fly tier Jay "Fishy" Fullum that was featured in Western Fly Tyer several years ago. After all the grief Rich had given me when I proudly unveiled my new pattern, disparaging it as a MacFoam Fly, I had to stop and consider for a few moments whether to give him one or not.  When he dangled the pathetically ripped deer hair hopper in front of me I had to relent. I gave him two, and told him to be careful with them.  Then, I made him show me where he had been fishing. We made our way upstream to a long gentle riffle about a half-mile in length. It was shallow in the middle with tall grassy banks along which there were deeper pockets formed by large rocks.  As we moved forward through the grasshoppers were everywhere. Rich directed me to make a cast about 40 ft upstream to a likely looking lie. As the hopper drifted back towards me and Rich reminded me to keep tight line control, a large brown exploded under the hopper. I had let just a couple of inches of slack line accumulate and the nice brown was gone. As I moved upstream to the next prospective lie I was determined not to lose another good fish to sloppy line handling. Since the brush was heavy at spots along the bank I waded into the river about 20 ft out from the bank.  From this angle I could easily cast to likely spots along the shore. The next fish to smash the hopper was a 16" rainbow and this time I was ready for him. He immediately went airborne and I quickly subdued and released him. Along this half-mile stretch of river I probably caught more than a dozen rainbows and browns primarily in the 14-16" range. The preponderance of 15 3/4" fish in the North Platte and many other Wyoming Gold Medal waters is probably due to the 10-16" slot limit on these waters. Many of the local anglers are not completely sold on the idea of Catch & Release fishing and lure fishing is also allowed with no restrictions on hook number. Unfortunately, Rapalas are a very effective lure here, so many trophy trout are harvested.

I had a number of notable experiences fishing this section of the Platte. A good-sized brown grabbed the hopper after it had been pulled under the current passing along the edge of a large rock. When I put tension on the line to begin another cast the brown bolted downstream and I was fast on to him. The largest fish I saw hit my hopper took it in a nonchalant head to tail rise giving me a perfect view of his broad rainbow stripe. As he submerged I set the hook only to have my hopper-less line come wafting back to me, the 4X tippet neatly severed, no doubt by a sharp tooth.

During this time Rich had crossed to the other side of the river and was madly yelling for me to come and net a large fish for him. The river in this section is nearly 100 ft wide and although it is relatively shallow, it is still tough wading because of the slippery basketball sized rocks.  When I finally made it across Rich had already landed a 23" brown. As we went to remove the yellow stimulator from its jaw we noticed something black inside its mouth. Rich yanked on it and out popped a partially digested 8" rainbow that had met its demise head first We marveled that a fish stuffed to the gills would still be feeding. Rich said that he had actually been casting to a different smaller trout when the monster came up from underneath to grab the stimulator first.  Rich had hooked and landed 8 good fish in this one nice run that flowed down behind a small island.

Since it was getting late in the afternoon we decided to start our hike back while there was still a chance there would be enough light to find our way to Corral Creek. As we were walking downstream the sun was dipping behind the canyon walls and the splashy rises that signify trout bombing caddis began. It was a tempting site but we were low on food and water and dinner was an hour hike away.

Whenever I go to the North Platte I always take a day or two to fish the mile of public water at Boulder Gap that is sandwiched between the large cattle ranch holdings along the river. To set foot on private property in Wyoming is to risk a $1000 trespass fee and a day in court, but Wyoming access laws are a convoluted story for another day. I have always done well in the Gap with dry flies and believe that you could fish the eariy morning trico spinner fall, switch to PMD's and caddis dries mid-morning, fish hoppers in the afternoon and switch back to caddis in the evening never fishing anything but dry flies. We have also done well with nymphs at the head of the large riffle that lies below the massive boulder. The largest trout I have caught out of the Boulder pool is a 21" brown that I hooked near the tailout on a brown bunny leech stripped aggressively in the late afternoon.

I hope to go back again within the next few years and spend a few days camping and fishing in the Gap. There is also very good fishing downstream of the Corral Creek in the canyon that runs to the Bennet Peaks campground about a mile away.

The largest trout I have caught out of the Boulder pool is a 21" brown that I hooked near the tailout on a brown bunny leech stripped aggressively in the late afternoon. I hope to go back again within the next few years and spend a few days camping and fishing in the Gap. There is also very good fishing downstream of the Corral Creek in the canyon that runs to the Bennet Peaks campground about a mile away.

I have no qualms about sharing this access information with you because this section of the Platte River appears to be underutilized and we have pretty much had the entire place to ourselves when we have been there in the past. The best months to fish this section of the Platte are August and September. September is notable for its prolific BWO hatches. July is generally unfishable due to algae blooms caused by the high day and nighttime temperatures and sparse rainfall. By late July and early August the summer thunderstorm pattern has started, in the Rockies this is known as the monsoon season and it brings cooler
water flows and a resumption of better fishing to the region.

There are numerous restaurants, motels, and fly shops in the nearby town of Saratoga. Not to mention an air strip capable of accommodating a 737. Probably the best known fly shops are Medicine Bow Drifters and Great Rocky Mountain Outfitters, both of which have websites (www.medbow.com, www.grmo.com) and up-to-date stream reports. But my favorite shop is Hack's Tackle, an unassuming bait, tackle, and fly shop where they dispense good advice and have very reasonable rates for guided trips (and no website, yet). Saratoga is a one hour drive from Laramie Airport, but most people fly into Denver and make the 4 hr drive to the Platte.

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