Williams Fork | Overview
Tucked away in a rugged canyon south of Parshall, the Williams Fork River is a true hidden gem of Grand County fly fishing. Fed by the Williams Fork Reservoir, this tailwater offers clear, cold, and consistent flows that make it a dependable year-round fishery — a welcome find when other rivers run high or warm. It’s a technical stream that rewards patient anglers with wild browns, strong rainbows, and an occasional cutbow that’ll put a bend in your rod and a grin on your face. Expect smaller water, tight casting lanes, and trout that demand precision. But for those who like to stalk fish, sight-cast, and fine-tune their presentation, the “Willy” is pure magic. Whether you’re nymphing midges and baetis in early spring or throwing dry flies to rising fish on a summer evening, this river is all about finesse. A good drift matters more than fly choice — though having a few size 20 midges and micro-mayflies never hurts.
Williams Fork - Below Williams Fork Reservoir: Current Discharge Loading...
Current Conditions
May 2026: Flows on the Williams Fork have dropped to around 10 CFS, which is definitely on the low side for a stretch that tends to fish best between 150 and 250 CFS. At these flows, conditions are extremely technical and fish are going to be very spooky in the clear water. Honestly, it may be worth looking at other options until flows bump back up a bit. That said, we’re still seeing a lot of BWOs, especially during the mornings and on cloudy days, while caddis have been coming off later in the afternoons and evenings. If you do decide to fish the Willy, focus on stealth, avoid unnecessary wading, and make your first cast count because you probably won’t get many second chances.
Recommended FLies
NYMPHS: Copper Ribbed RS2 20-22, Flashback Pheasant Tail 16-20, Barr's Emerger BWO 18-22, Perdigons 16-18, Thread body Frechie (olive) 16-18), JuJu Baetis size 18-22, Zebra midge black or olive size 18-22, Pats Rubber Legs (coffee, olive) 10-14
DRIES: Para Wulff 18-24, Parachute Adams 18-24, Chubby (gold) 8-14
STREAMERS: - Leach (black, olive), Rusty T, Double Thin Mint, Goldie
