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A real photograph of the North Platte River in Wyoming, used as representative river context rather than an exact Grey Reef access image
All Wyoming reports

North Platte River at Grey Reef

Photo: Tony Webster Opens in a new tab. · CC BY 4.0

Should I go fishing?

Skip fishing here today.

No access method is recommended today. Review the live conditions below before choosing another river or day.

Check first: USBR GGWY discharge, weather, and alerts support Grey Reef planning. Water temperature, flushing notices, wind, launch status, closure boundaries, and private-bank constraints require separate checks.

Rating updatedRiver local time:

Why this recommendation?

An active alert is in effect: Red Flag Warning issued September 9 at 12:58PM MDT until September 10 at 9:00PM MDT by NWS Riverton WY. Check public safety sources before going.

Available live dataMediumHow much of the live flow, weather, and alert data came back.
Confidence in this recommendationMediumUSBR GGWY discharge, weather, and alerts support Grey Reef planning. Water temperature, flushing notices, wind, launch status, closure boundaries, and private-bank constraints require separate checks.
Sources checked often
Before you go

Red Flag Warning issued September 9 at 12:58PM MDT until September 10 at 9:00PM MDT by NWS Riverton WY

If you go

Check first
USBR GGWY is the current official river-discharge station. USGS 06642000 ended continuous discharge in 1998 and is not configured as live.
Try
Open USBR GGWY and the current rule map before choosing dam, ramp, or downstream access.
Leave when
Skip for active flushing flows, severe wind or lightning, an inaccessible launch, unknown current discharge, or any plan that enters a signed spring closure.

Flow and weather

Showing server-checked river conditions while current readings refresh.
Flow
—
Live flow is not available here.
Air forecast
78°F
Next 24h high
81.0°F

NWS air forecast near

Rain chance
0%

This is an air forecast, not a river-temperature reading. Check the water with a stream thermometer before fishing in hot weather.

Latest stored weather check

Sunny

Wind
15 mph
Weather checked
More forecast and source details

Sunny

National Weather Service

North Platte River at Gray Reef Dam

The National Weather Service forecast is temporarily unavailable.

Live data

Where these readings come from

RiverReports gauge: North Platte River at Grey Reef (USBR-backed)

RiverReports gauge Opens in a new tab.Official NWS forecast Opens in a new tab.

Flies for this time of year

Seasonal starting points, not a live hatch report. Match what you see on the water.

See flies for every season
SeasonWhat to look forFlies to try

Each fly name opens its matching Fly Box guide.

More fishing tips

Methods, fish species and trip notes

How to fish North Platte River at Grey Reef today.

A fresh stable USBR trend, open chosen subreach, manageable wind, and legal launch make the cleanest nymph, dry-fly, or streamer plan. Because USBR is not yet a structured score provider, flow-dependent score confidence must remain limited rather than borrowing a dead USGS feed.

Stable USBR trend

Choose an open segment and match depth, weight, and boat plan to the actual release.

Flushing flow or sharp change

Treat the official notice as a hard safety override and stay off the river during the pulse.

Spring closure dates

Route around the two signed closed subreaches. Do not fish or launch into them.

High wind or lightning

Avoid exposed floats and open-river launches even when discharge looks favorable.

Wading, bank fishing or floating?
Not recommended todayChoose another river or day

No access method is recommended in today's conditions. Review the live river and weather checks before making another plan.

Wading0/100

Not recommended today. Recheck the river, weather, and access before planning another trip.

Bank fishing2/100

Not recommended today. Recheck the river, weather, and access before planning another trip.

Floating0/100

Not recommended today. Recheck the river, weather, and access before planning another trip.

Full river report

Is North Platte River at Grey Reef worth the trip today? Check flow, weather, hatches, access, and rules for Wyoming before you go.

Grey Reef is not one undifferentiated tailwater. The core rule applies from Gray Reef Dam to Government Bridge, while two smaller subreaches close April 1 through May 15. Use current USBR GGWY discharge and route around only the segments actually closed.

Fishing words used on this page
U.S. Geological Survey (USGS) gauge
A USGS gauge is an official river station that measures flow or water height.
Cubic feet per second (cfs)
Cubic feet per second, or cfs, shows how much water passes the gauge each second.
Nymph
A nymph is a young water insect. Anglers also use the word for a fly that copies it.
Blue-winged olive (BWO)
Blue-winged olives, or BWOs, are small mayflies that often hatch in cool or cloudy weather.
Caddis
Caddis are small water insects. The adults look a little like tiny moths.
Emerger
An emerger copies an insect as it rises from below the water toward the surface.
Midge
Midges are tiny flies and a common trout food, especially in cold water.
Pale morning dun (PMD)
Pale morning duns, or PMDs, are light-colored mayflies that often hatch in warmer months.
Scud or cressbug
Scuds look like tiny freshwater shrimp. Cressbugs are small bugs that crawl along the river bottom.
Streamer
A streamer is a fly that looks like a small fish, leech, or other swimming food.
Why this call

Why this score

Public alertHurts

An active alert is in effect: Red Flag Warning issued September 9 at 12:58PM MDT until September 10 at 9:00PM MDT by NWS Riverton WY. Check public safety sources before going.

FlowUse caution

RiverReports is linked for the flow chart, but this page does not have a structured live flow value the score can read automatically. Treat the rating as conservative and open the chart before committing.

Water temperature checkUse caution

USBR GGWY discharge does not replace a water-temperature reading in the chosen Grey Reef segment. Measure the reach and stop targeting trout at 70°F or warmer. Choose another water at 70°F or warmer.

SeasonHelps

Fall: Cooler weather, BWOs, and streamers can work with lower pressure.

WeatherHelps

The current NWS air forecast is about 78F, and the next 24-hour high reaches about 81F. Sunny.

Trip notes

Check these before you choose a reach.

Best flows

Favor a fresh stable USBR GGWY trend that fits the chosen wade or boat plan. The page intentionally avoids a universal threshold and a dead USGS shortcut.

When to leave

Skip for active flushing flows, severe wind or lightning, an inaccessible launch, unknown current discharge, or any plan that enters a signed spring closure.

Local plan

Choose the open segment and access first, check GGWY, verify the closure dates and signs, then rig for the depth you actually find.

Backup water

Use another open Grey Reef segment or a separately verified Wyoming river rather than fishing a closure or forcing unsafe wind.

North Platte River at Grey Reef access and rules.

Use these places as starting points. Open the access link below and check posted signs before you park or enter.

Before you go

From Gray Reef Dam to Wyoming Highway 220/Government Bridge, the 2026 rule is one trout with all trout under 20 inches released, single-point barbless-hook artificial flies or lures only, and pegged attractors prohibited. Separate signed segments at the gauge cables and from Ledge Creek toward S Gulch close April 1-May 15. Current Wyoming rules and signs are the legal authority.

Where to access the river

Gray Reef Dam recreation area

USBR documents the fishing pier, restroom, primitive camp, small-craft launch, and ramp/parking roughly one-half mile below the dam.

Ledge Creek

BLM identifies this as watercraft-only access with public/private boundary markers. It is also part of a spring closure boundary and must be checked carefully.

Government Bridge area

The downstream endpoint for the core special-rule reach. Verify current public access and private-bank markers before a float.

  • Ledge Creek is watercraft-only access. Do not describe it as ordinary roadside bank entry.
  • Blue boundary markers indicate public land and red markers private land in the BLM area. Follow current signs.
  • Flushing-flow schedules, ramp conditions, wind, and shuttle logistics should be confirmed before launching.
More rules and access notices
Seasonal — check datesSeasonal closure

Grey Reef gauge-cable spring closure

Applies to: Between the signed gauge-cable crossings, with the first crossing about 700 yards below Gray Reef Dam

When: April 1-May 15 annually

Source reviewed:

This is one signed subreach, not a closure of the full dam-to-Government Bridge corridor.

Open official source in a new tab
Seasonal — check datesSeasonal closure

Grey Reef Ledge Creek to S Gulch spring closure

Applies to: Ledge Creek confluence downstream about 1.2 miles to S Gulch

When: April 1-May 15 annually

Source reviewed:

This is a second, separate signed subreach, not a closure of the full tailwater.

Open official source in a new tab

If this water does not fit the day, check another report before you start the drive.

ColoradoNorth Platte River fishing reportA separate Northgate/North Park report far upstream with different rules, hazards, and gauge.WyomingBighorn River fishing reportAnother Wyoming tailwater alternative with its own release and access contract.WyomingEncampment River fishing reportA smaller freestone option requiring a separate runoff and access check.
See all Wyoming fly fishing reports

Sources and report details

Official agencies and primary river operators come first. Secondary tools are labeled so you know what carries the most weight.

Rules and closures

Check what is allowed, where the rule applies, and whether the river is open.

Flow and weather

Check the latest river reading and forecast before you leave.

Access and land

Check public entry points, land rules, and seasonal access changes.

More helpful links

Use these links for stocking, safety, and other local details.

See all 13 checked sources

Rules and closures

Check what is allowed, where the rule applies, and whether the river is open.

Flow and weather

Check the latest river reading and forecast before you leave.

Access and land

Check public entry points, land rules, and seasonal access changes.

More helpful links

Use these links for stocking, safety, and other local details.

Recently checked. Last checked . Conditions and rules can still change, so open decision-critical links before fishing.

See something wrong? Report a source problem. Please do not send private spots or private access notes.

How this report was checked

How this report was checked

Trip guidance checked

What was checked: This restored report is maintained from official flow, regulation, access, weather, and public-land sources. Planning guidance is separated from live observations and legal rules.

Live measurements and forecasts keep their provider timestamps. Rules, access, and trip guidance use the source-review date shown here. BlueStreamFly planning advice is editorial interpretation, not an agency notice.

First-hand experience: BlueStreamFly does not claim a first-hand visit or local field test for this report unless a real contributor is explicitly named and linked.

Quick questions

What water does this North Platte at Grey Reef report cover?

The regulated tailwater from Gray Reef Dam toward Highway 220/Government Bridge, with two spring closure subreaches identified separately.

What should I check first before fishing North Platte at Grey Reef?

Check USBR GGWY discharge, Wyoming's 2026 rule, both April 1-May 15 closure boundaries, flushing notices, wind, and the exact launch or access.

Is access straightforward on North Platte at Grey Reef?

Official dam and BLM access exists, but Ledge Creek is watercraft-only and public/private bank markers still control downstream use.

Does the fishability score replace local judgment?

No. Use it as a starting decision, then confirm the source timestamp, official rules, alerts, water temperature, visibility, and conditions at the access you actually plan to use.