green-river

Green River is a river in Utah.

It ranks #1 among the 14 waters of Utah in the registry, and is of national prominence.

Also called Upper Green River.

Fished for trout (inferred from the species listed).

Species: rainbow trout, brown trout, cutthroat trout and mountain whitefish.

USGS GNIS record: 45730.

It shares a watercourse with Blue River, Colorado and Colorado River, Colorado.

Stretches: A Section, B Section and C Section.

Access points: Indian Crossing, Little Hole, Spillway Boat Launch, Swallow Canyon, Swinging Bridge and Taylor Flat Bridge.

Confluences: Red Creek Rapid.

Features: Mother-in-Law Rapid.

Float: A Section, from Spillway Boat Launch to Little Hole, 7 miles.

Float: C Section, from Indian Crossing to Swallow Canyon, 11.5 miles.

Float: B Section, from Little Hole to Indian Crossing, 9 miles.

Sourced from 3 independent fly sites.

Sources: adventuretoursvernal.com (retrieved 2026-10-20), assets.earthdiver.com, dutchjohnadventureoutpost.com (retrieved 2026-10-20), fishingreports.orvis.com, norrik.com, roadtripryan.com, Spinner Fall Guide Service, troutbum2.com (retrieved 2026-10-20), visitutah.com and visitutah.com (2).

Hatches

Yellow Sally

Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching
  7. Jul hatching
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Templated chart only: secondary. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Caddis

Stage: adult. Single or templated source.

  1. Jan
  2. Feb
  3. Mar hatching
  4. Apr hatching
  5. May hatching
  6. Jun hatching
  7. Jul hatching
  8. Aug hatching
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Templated chart: early caddis by late March in warmer Section B water; primary April-September. An outfitter recommends elk hair caddis for summer hatches, in both faster riffles and slower pools. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: dutchjohnadventureoutpost.com, The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Trico

Stage: spinner. Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug hatching
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Templated chart: primary August, secondary September. A shop's undated conditions summary also names Tricos (size 22) and Pseudocloeon as the main hatches. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: troutbum2.com, The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Blue-Winged Olive

Stage: dun. Single or templated source.

  1. Jan
  2. Feb hatching
  3. Mar hatching
  4. Apr hatching
  5. May hatching
  6. Jun
  7. Jul
  8. Aug
  9. Sep hatching
  10. Oct hatching
  11. Nov hatching
  12. Dec

Called the most famous spring hatch; BWO parachutes for spring and fall in Sections A and B; fall Baetis hatches (no dates). Months come from a templated chart (primary February-May and September-November). The template is shared across several rivers; treat as generic regional, not water-specific. A state wildlife report of 5-9-2025 says the hatch was in full swing in early May. Season: spring and fall.

Sources: dutchjohnadventureoutpost.com, sportfishingreport.com, The Fly Fishing Place, sportfishingreport.com, The Fly Fishing Place, sportfishingreport.com, The Fly Fishing Place

Pale Morning Dun

Stage: dun. Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr hatching
  5. May hatching
  6. Jun hatching
  7. Jul hatching
  8. Aug
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Templated chart only: starts late April, primary May-June, secondary July; described as the river's defining summer hatch. Other pages say only that PMDs hatch; one shop's undated conditions summary names caddis and PMDs as main hatches. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: troutbum2.com, The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Pale Evening Dun

Stage: dun. Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May hatching
  6. Jun hatching
  7. Jul hatching
  8. Aug hatching
  9. Sep
  10. Oct
  11. Nov
  12. Dec

Templated chart only: primary or secondary May-June, secondary August. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Midge

Stage: larva, pupa, adult. Single or templated source.

  1. Jan hatching
  2. Feb hatching
  3. Mar hatching
  4. Apr hatching
  5. May hatching
  6. Jun hatching
  7. Jul hatching
  8. Aug hatching
  9. Sep hatching
  10. Oct hatching
  11. Nov hatching
  12. Dec hatching

A cold, stable tailwater supports midges year-round; zebra midges essential in winter. A templated chart lists every month (primary January-March and October-December). The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: dutchjohnadventureoutpost.com, The Fly Fishing Place, The Fly Fishing Place, adventuretoursvernal.com, The Fly Fishing Place

Grasshoppers, ants, beetles

Stage: adult. Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun hatching
  7. Jul hatching
  8. Aug hatching
  9. Sep hatching
  10. Oct
  11. Nov
  12. Dec

Terrestrials matter most in late summer and fall, especially in Sections B and C. Templated chart: hoppers begin June, primary July-September. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: dutchjohnadventureoutpost.com, The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Mahogany Dun and October Caddis

Single or templated source.

  1. Jan
  2. Feb
  3. Mar
  4. Apr
  5. May
  6. Jun
  7. Jul
  8. Aug
  9. Sep hatching
  10. Oct hatching
  11. Nov
  12. Dec

Templated chart only: secondary. The template is shared across several rivers; treat as generic regional, not water-specific.

Sources: The Fly Fishing Place, The Fly Fishing Place, The Fly Fishing Place

Also named, timing not yet researched: Salmonfly.

Access, closures and rules change; check with the state agency before you go.