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New York | St. Lawrence County / Clare and Russell
Grass River
Lampson Falls Waterway Access Site to Downerville State Forest / Grass River confluence access
Route planning details, access notes, and local verification guidance.
Route location
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Need to know
Why this call
Conditions
Gauge history and hourly forecast
Use the gauge context and hourly forecast to verify local conditions before launching.
Gauge detail
Gauge history & hourly forecastDetailed view
Gauge
Recent trend
Checking preferred range.
Checking trend.
Gauge source
--Checking timestampMN DNR provides the current paddling level here, but not chart-ready recent samples.
Weather
Hourly forecast
Checking weather.
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Next 8 hours
Short-route forecast
Checking the next several hours.
Route overview
Quick facts and what's next
Distance, difficulty, shuttle basics, and the near-term outlook before you commit to the drive.
Quick facts
Plan ahead
Upcoming outlook
These are early planning reads. Re-check live conditions before you commit to the drive.
Waiting on forecast.
Waiting on forecast.
Plan
Plan your trip
Launch points, shuttle details, distance, and access notes.
Route logistics
Access and shuttle
An advanced planning-only 4.1-mile Grass River section from the public Lampson Falls Waterway Access Site to the Downerville State Forest access at the North Branch confluence. American Whitewater identifies the seasonal Class IV+ reach, named rapid sequence, and public Downerville take-out path; NYSDEC documents the Lampson Falls carry, Downerville public forest access, nearby designated camping, and the river corridor’s changing road and access conditions.
Prepare this trip
Take the plan with you
Download the canonical route, add a calendar hold, or send a simple float plan to your group.
Put-in
Lampson Falls Trailhead / Waterway Access SiteThe Lampson coordinate is a DEC trailhead/access-area anchor with a documented 0.4-mile carry; the Downerville coordinate is the DEC River PFAR parking/kiosk anchor reached by a path from the confluence. Neither is presented as a surveyed dock or exact waterline point.
Take-out
Downerville State Forest River PFAR Parking Area and KioskThe route ends at the Downerville access before the separate Downerville-to-Russell reach. Continuing downstream requires a separate review of the public take-out, route boundary, gauge posture, and access chain.
Plan this segment
Pulling access map tiles. Usually under 5 seconds.
Access caveats and watch for
Access caveats
- The Lampson coordinate is a DEC trailhead/access-area anchor with a documented 0.4-mile carry; the Downerville coordinate is the DEC River PFAR parking/kiosk anchor reached by a path from the confluence. Neither is presented as a surveyed dock or exact waterline point.
- The route ends at the Downerville access before the separate Downerville-to-Russell reach. Continuing downstream requires a separate review of the public take-out, route boundary, gauge posture, and access chain.
- NYSDEC says roads, conservation-easement access, and forest-management restrictions can change. Obey gates and signs, stay on designated roads/trails, and never infer private-bank or leased-camp permission from navigability or a map coordinate.
Watch for
- USGS 04265432 unavailable, rapidly changing, below the local runnable character, or inconsistent with the Lampson/Downerville visual
- Lampson Falls and the 0.4-mile carry, current wood/strainers, Old Bridge, Thanks/No Thanks, Dan’s Hole, S-Turn, Snot Rocket, The Slots, North Country Boof, shallow rock, cold water, and limited egress
- Downerville road/ford/path/landing, parking, North Branch confluence, private boundaries, seasonal closures, and the mandatory downstream boundary before Russell
Route gallery
See this route on the water
Photos help show what the access looks like and what the route actually feels like on the water.
No approved route photos yet
Start the gallery with shots of the access, river character, or any detail that helps paddlers know what this run actually looks like.
Score & sources
Data and sources
See the gauge, weather, and source notes behind today's call.
Why this scoreToday's evidence strength is checking
Evidence strength mostly comes down to three things: how direct the active gauge is, how clear the range is, and how fresh the data is.
- Checking evidence-strength notes.
- Checking evidence cautions.
Data behind the scoreGauge, thresholds, and timing
These are the live readings and threshold notes behind today's score.
| Gauge site | Grass River at Chase Mills, NY |
| Discharge | Checking |
| Gauge height | Checking |
| 24h trend | Checking |
| 24h change | Checking |
| Current band | Checking |
| Rain last 24h | Checking |
| Rain last 72h | Checking |
| Air temp | Checking |
| Water temp | Checking |
| Wind | Checking |
| Gusts | Checking |
| Rain timing | Checking |
| Ideal range | Needs paddler reports |
| Known low-water floor | Not calibrated yet |
| High threshold | Not calibrated yet |
| Evidence strength behind the range | Official and local sources |
| Gauge observed | Checking |
| Paddle Today updated | Checking |
| Main source behind this score | No numeric go/no-go threshold published for this reach; American Whitewater describes a seasonal Class IV+ section, and its current page reports flows only as below recommended. Use Chase Mills as downstream same-river context plus local visual assessment, recent rain, wood, and feature-by-feature scouting. |
| Gauge source | Checking |
| Weather source | Checking |
| Rainfall source | Checking |
NotesWhat to know before you go
These notes cover the access details, route quirks, and source caveats most likely to matter once you get there.
- Named moving-water corridorLampson Falls to Downerville; 4.1 miles; Class IV+
American Whitewater publishes this exact reach, its seasonal character, feature sequence, and downstream take-out description.
- Public access and carriesDEC Lampson Falls trailhead/waterway access carry and Downerville State Forest River PFAR parking/kiosk
NYSDEC lists the 0.4-mile Lampson Falls carry and the Downerville public forest parking/frontage; American Whitewater identifies the path from the North Branch confluence to the take-out.
- Feature and flow postureSeasonal high-consequence reach; no numeric threshold accepted
American Whitewater reports the feature-level hazard sequence and uses a West Branch Oswegatchie gauge with flows marked below recommended; the current route uses the live Chase Mills Grass River station only as a same-river downstream proxy and requires local inspection.
- Camping postureNearby designated DEC primitive sites; no riverbank camping claimed
NYSDEC documents designated sites near Lampson/Harpers Falls and Downerville access sites while requiring current state-land rules and site checks.
- Proxy flow contextUSGS 04265432 Grass River at Chase Mills
This is downstream same-river telemetry, not a local threshold for the upper reach; branch inflow, rain, wood, and feature conditions control.
- Route imageUSGS Grass River station photograph used as clearly labeled same-river context
The presentation image is river context and does not claim to depict the Lampson Falls rapids, portages, or Downerville landing.
- Same-river proxy gaugeUSGS 04265432, Grass River at Chase Mills, NY
USGS 04265432 at Chase Mills is a downstream same-river proxy for this upper Grass reach. Local tributary inflow, rainfall, wood, water temperature, bedrock, and portage conditions can diverge materially; no numeric threshold is asserted.
- Safety and river conditionsCheck live gauge, recent rainfall, trend, debris, bridges, and access conditions before launch
American Whitewater / NYSDEC Grass River Complex and Downerville State Forest and its linked safety material warn that conditions change rapidly and require local inspection.
- Image decisionApproved watershed/proxy-gauge context image used for route presentation
The image is clearly labeled as watershed/proxy-gauge context and does not claim to depict this exact reach.
Verify it yourselfCheck the source links
Use these links to double-check the gauge, route details, and access notes before you head out.
- American Whitewater / NYSDEC Grass River Complex and Downerville State Forest route record
- NYSDEC Grass River Complex and Downerville State Forest access anchors
- American Whitewater Grass River Lampson Falls to Downerville flow and feature notes
- NYSDEC Grass River Complex paddling and portage guidance
- USGS 04265432 monitoring location
- USGS 04265432 current conditions
- Grass River context image
Paddler reports
Recent notes from paddlers
A few quick notes from people who were on this route recently.
Reports
Paddler reports
See recent photos and notes from people on the route.
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More routes to check next
Compare another stretch on this river, or jump to nearby options before you pick a plan.
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Quick answers
Grass River paddling FAQ
What water level is good for paddling Grass River?
Paddle Today watches Grass River at Chase Mills, NY and uses Not calibrated yet as the conservative low-water floor for this route. The ideal range still needs more paddler reports.
Where does this Grass River route start and end?
This route starts at Lampson Falls Trailhead / Waterway Access Site and ends at Downerville State Forest River PFAR Parking Area and Kiosk, about 4.1 whitewater river miles on the water.
Is this Grass River route good for beginners?
This is listed as a hard route. Treat the live score as a planning aid, then confirm conditions, hazards, access, and group skill before launching.
Flag a change
See something outdated?
Access, hazards, wood, and shuttle details change. Send a quick correction if something looks off.