Rio Mora Near Terrero
Rio Mora · Rockies · USGS gage 08377900
Coldwater (summer mean 14.3°C — prime coldwater).
Water
68°F
Flow
6 cfs
Air
76°F
Sky
0%
Pressure
29.65 in
Wind
4 mph
Predicted hatches · 2026-07-31
PredictedSlate Drake / IsonychiaIsonychia spp.1.00
Predicted by conditions; no reports yet. water 19.8°C (68°F) sits in the prime band (16-21°C); peak season; 8 days sustained ≥14°C; low pressure — fish looking up; watch afternoon/evening; nymphs crawl to shore to emerge.
flies: Isonychia #10-12, Slate Drake, Leadwing Coachman
PredictedSpotted / Summer CaddisHydropsyche spp.0.81
Predicted by conditions; no reports yet. water 19.8°C (68°F) is cooling past the prime band (14-19°C); peak season; 8 days sustained ≥12°C; low pressure — fish looking up; watch evening, last hour of light.
flies: Elk Hair Caddis #14-16, Iris Caddis, X-Caddis
PredictedHopper / TerrestrialsAcrididae (grasshoppers)0.62
Predicted by conditions; no reports yet. water 19.8°C (68°F) sits in the prime band (17-24°C); shoulder of the season; 8 days sustained ≥14°C; warm sun favors it; low pressure — fish looking up; watch warm, breezy afternoons.
flies: Morrish Hopper #8-12, Chubby Chernobyl, Dave's Hopper
PredictedTricoTricorythodes spp.0.55
Predicted by conditions; no reports yet. water 19.8°C (68°F) sits in the prime band (16-21°C); shoulder of the season; 8 days sustained ≥15°C; low pressure — fish looking up; watch early morning spinner falls.
flies: Trico Spinner #20-24, CDC Trico, Griffith's Gnat
PredictedLight CahillStenacron / Stenonema0.55
Predicted by conditions; no reports yet. water 19.8°C (68°F) sits in the prime band (16-20°C); shoulder of the season; 8 days sustained ≥15°C; low pressure — fish looking up; watch dusk.
flies: Light Cahill #14-16, Cream Cahill, Cahill Spinner
PredictedPale Morning DunEphemerella spp.0.44
Predicted by conditions; no reports yet. water 19.8°C (68°F) is cooling past the prime band (13-18°C); peak season; 8 days sustained ≥12°C; low pressure — fish looking up; watch late morning to early afternoon.
flies: PMD Comparadun #16-18, Sparkle Dun, Pheasant Tail #16
PredictedGolden StoneHesperoperla / Calineuria0.44
Predicted by conditions; no reports yet. water 19.8°C (68°F) is cooling past the prime band (14-18°C); peak season; 8 days sustained ≥13°C; low pressure — fish looking up; watch afternoon and evening.
flies: Chubby Chernobyl #8-10, Yellow Stimulator, Pat's Rubber Legs
PredictedSulphurEphemerella dorothea / invaria0.40
Predicted by conditions; no reports yet. water 19.8°C (68°F) is cooling past the prime band (15-19°C); shoulder of the season; 8 days sustained ≥13°C; low pressure — fish looking up; watch evening, the last two hours of light.
flies: Sulphur Comparadun #16-18, Sulphur Spinner, Pheasant Tail
PredictedHexagenia (Hex)Hexagenia limbata0.36
Predicted by conditions; no reports yet. water 19.8°C (68°F) sits in the prime band (19-23°C); shoulder of the season; low pressure — fish looking up; bright moon — night activity; watch after dark — the famous night hatch.
flies: Hex Dun #4-8, Hex Nymph, Hex Spinner
PREDICTED from the first-principles model only. Report-confirmed signal (fly-shop & forum reports) is the next milestone.