Fly Fishing Hams Fork - Below Viva Naughton

Fly fishing Hams Fork – Below Viva Naughton means trading Wyoming's headline rivers for a willow-lined stream that almost nobody talks about. The reach starts at the outlet of Viva Naughton Reservoir and works down through open meadow country toward Kemmerer, sitting at better than 7,000 feet in the high desert of the Green River Basin. It is quiet, close-range water — riffles you can read from the bank, undercut edges, and trout that will take a small dry with confidence when the drift is honest.

The reservoir upstream sets the tone. Releases from the dam soften the freestone swings the upper Hams Fork would otherwise deliver, holding steadier flows and cooler summer temperatures and stretching the productive season well into the shoulder months. What you get is a medium-sized stream moving through willows in a repeating sequence of riffle, run, and pool, dropping a little over twenty feet per mile — enough gradient to keep the water broken and oxygenated without turning it into pocket-water gymnastics. The water runs clear, so sight-fishing chances turn up regularly, and the trout are numerous enough to keep you busy and selective enough to keep you honest.

Rainbow trout are the reason this reach has a reputation among the few who know it. The density is genuinely unusual, and the average fish runs around sixteen inches, with a good number stretching to eighteen and beyond. That mix of numbers and size is what put the Hams Fork on the short list of Wyoming destination fly-fishing waters despite its low profile. Brown trout share the river and take over the story the farther downstream you go; between Kemmerer and the public water below the city reservoir the browns run considerably heavier.

The insect menu is deeper than a river this size has any right to carry. Midges are the year-round backbone, and the slower flats below the dam fish especially well on tiny patterns through the cold-water stretches of the year. Blue-winged Olives bracket the season, coming off on gray, overcast afternoons in both spring and fall. Pale Morning Duns fill in as a dependable midday mayfly once summer settles, golden stoneflies bring the early-summer heavy-water window, caddis take over the afternoons and evenings, and late-summer Trico spinner falls make for technical morning fishing in the soft water. Terrestrials — hoppers, ants, and beetles along those grassy banks — matter from midsummer until the first hard freeze, and a big orange fall caddis closes things out.

Read flows carefully here, because there is no active real-time gage on this reach. Conditions have to be planned from reservoir-release patterns and a recent on-the-water report rather than a live number, which is the single biggest difference between this river and a gauged one. Spring into early summer brings high, off-color runoff best left alone; the long drawdown from summer into fall is the prime window. This is wade water, not a float — the willows are thick and the wading is moderate, so a five-weight and a long-handled net earn their keep.

Access is better than the river's obscurity suggests. Marked Wyoming Game and Fish sites begin roughly seven miles upstream of Kemmerer along the Hams Fork Road, all reachable by passenger vehicle outside of winter. Fish density concentrates in the first five miles below the reservoir outlet, so the upper sites deserve priority. Kemmerer is the hub — a small ranching town with a historic main square — with Fossil Butte National Monument just west for a layover day, and the nearest commercial air service at Rock Springs, about ninety minutes east.