Letort Spring Run Fly Fishing Report
Carlisle, Cumberland County, Pennsylvania · Last Updated: August 6, 2026
A tiny, spring-fed limestone stream near Carlisle, the Letort is sacred ground for American fly fishing. Vince Marinaro and Charlie Fox developed their revolutionary dry fly techniques here, and the impossibly selective wild brown trout still test the finest anglers today.
Today's Trout Fishability
Conditions at a Glance
Flow on the Letort Spring Run is above normal at 34 cfs, 28 percent higher than average within the 13-113 cfs historical range.
- Heavy rain may blow out and muddy the water
- High, off-color water
- Heavy rain/storms likely
How Do You Fish a 4.6/10 Day?
See the fly patterns built for today's conditions, where the fish are holding, and how to work the 5:30 AM - 9:00 AM, 6:00 PM - 8:00 PM window.
Today's Weather
See hourly conditions, wind speeds, barometric pressure, and 5-day outlook
USGS Water Monitoring
Real-time data from 1 monitoring stations
See station-by-station details, historical ranges, and trend analysis
What's Hatching This Month
Northeast — typical for August
Sources: FlyFishFinder — New York Hatch Chart,Jerry Bartlett Angling Collection — Esopus Creek Hatch Chart
4.6/10 Today — See the Full Letort Spring Run Breakdown
Free account unlocks fly patterns, a hatch forecast, and tactics matched to today's exact flows. 3 reports a month, no credit card.
Letort Spring Run Fly Fishing — FAQ
Is the Letort Spring Run fishing well right now?
DriftWise scores the Letort Spring Run every morning on a 0–10 fishability scale that weighs real-time USGS flow and water temperature, National Weather Service forecasts, and lunar data. Check the live fishability score and condition summary above for today's rating before you head out.
What is the current water flow on the Letort Spring Run?
The Letort Spring Run's flow is tracked by USGS streamflow gauges near Carlisle, Cumberland County, Pennsylvania and refreshed daily in the condition summary above. Flow is reported in cubic feet per second (cfs) and compared against the seasonal average so you can see whether the river is running high, low, or normal.
What is a good water temperature for trout on the Letort Spring Run?
Trout feed most actively when water temperatures sit roughly between 48°F and 62°F. DriftWise reads live Letort Spring Run water temperature from USGS sensors near Carlisle, Cumberland County, Pennsylvania — see the summary above for the current value.
When is the best time of day to fish the Letort Spring Run?
The most productive windows shift with the season: cold months fish best around midday (10 AM–2 PM) once the water warms, while summer rewards early mornings and evenings. Each Letort Spring Run report factors in the current season.
Do I need a fishing license to fly fish the Letort Spring Run?
Yes. A valid Pennsylvania fishing license is required to fish the Letort Spring Run. Check current Pennsylvania regulations for seasons, limits, and any special catch-and-release or fly-fishing-only sections before you go.
Is the DriftWise Letort Spring Run fishing report free?
Yes. The daily Letort Spring Run condition summary — flow, water temperature, weather, and fishability score — is free. A free account (3 reports per month) unlocks the full AI analysis with fly-pattern recommendations and a detailed hatch forecast.
Simple Pricing. No Surprises.
Start with 3 free reports a month. Upgrade when you're fishing more than you're working.
Starter
$0 / year
- 3 reports per month
- Current river conditions & weather
- Reports available for 30 days
- Access to all U.S. rivers
Pro
$50 / year (Save 17%)
- 30 reports per month
- Reports saved permanently
- Personalized to your fishing profile
- Plan future trips with advance reports
- Weekly email reports for saved rivers
- Priority support