What flies are hatching on the Spring River right now?

Current and seasonal hatches on the Spring River include Midge, Blue-Winged Olive, Sulphur. Use the AI Hatch Advisor on this page for a live, temperature-aware recommendation.

What's the current flow on the Spring River?

The Spring River is running at 267 CFS at the Mammoth Spring at Mammoth Spring gauge. Readings update every 15 minutes from the USGS Water Services API.

Is the Spring River fishable today?

Yes — Spring River is rated fishable right now. Current flow is 267 CFS at the Mammoth Spring at Mammoth Spring gauge.

Spring River Fly Fishing Conditions

Live Conditions

Spring River — Mammoth Spring at Mammoth Spring

Fishable

267CFS

Discharge

4.19ft

Gauge Height

—

Water Temp

Updated 1 hr agoView on USGS ↗

7-Day Flow

→ Stable

RisingFallingStable

24-Hr Pressure

29.52 inHg · → High/stable

Falling (good)RisingHigh/stable

Local Weather

78°FClear sky

Wind 2 mph29.52 inHg Low & stable

Tough conditions — fish deep

Today

🌤️

Mainly clear

99° / 67°

Tomorrow

☁️

Overcast

102° / 72°

Wed

☁️

Overcast

102° / 76°

Thu

☁️

Overcast

102° / 77°

Cold front incoming — go deep with nymphs, surface activity likely slow.

Weather by Open-Meteo · No API key · Updated every 30 min

What should I fish today?

⚡ AI

AI-powered recommendation using today's live flow, temperature, and hatch data.

9

Time of Day

Using: 267 CFS · BWOs returning on cloudy days

What should I pack?

Rod, flies, tippet, and safety gear specific to today's Spring River conditions.

🪰 Hatch Calendar

Spring River · September · Early Fall

Full calendar →

Showing typical dates — water temperature data unavailable for live hatch predictions.

Select month

JanDec

BWOs returning on cloudy days (size 18-20). Midges. Scuds. Caddis tapering.

Blue-Winged OliveCaddisMidge

River Map

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USGS Gauge (click for site ID)Fishing Access / SectionScroll to zoom disabled — use map controls

About Spring River

The Spring River begins at Mammoth Spring — one of the largest springs in the world, discharging a rock-steady ~270 CFS year-round at a constant 58°F. Stocked rainbow trout (and some brown trout) thrive in the cold spring-fed water for the first miles below the spring, before the river warms and transitions to smallmouth water further south. The Mammoth Spring gauge is among the most stable in the country — flows barely fluctuate season to season. A great year-round, beginner-friendly Ozark trout option.

MidgeBlue-Winged OliveSulphurCaddisScuds

Regulations

Arkansas fishing license + trout permit required (resident ~$10.50 + ~$10.00 trout permit = ~$20.50/year). Year-round season; standard trout regulations on the stocked rainbow section below Mammoth Spring. No special emergency regulations on the Spring River as of Feb 2026. Verify current rules at agfc.com before fishing.

Learn More

Guides to help you fish Spring River with more confidence.