Upper section
Marsh and quiet
Meanders through a large marsh with very little development. Slow and pretty.
Lower Peninsula River Guide / Cass County to the St. Joseph River at Three Rivers
Rocky River Kayaking Guide: Launches, Dams & Flows
Wild Rivers. Rugged Trails. Real Adventure.
One of the three rivers that give Three Rivers its name. The Rocky winds through marsh and woods from Cass County to downtown Three Rivers, where it ends with riffles and the tricky Memory Isle rapids. Not to be confused with the Rocky River in Ohio.
RegionSouthwest Michigan
CountiesCass, Kalamazoo, Van Buren, St. Joseph
WatershedMore than 100,000 acres
Great Lake BasinLake Michigan
River LengthAbout 28 miles
PaddleableMarcellus area to Three Rivers, about 21 miles
Best SeasonMay to October
MouthSt. Joseph River in Three Rivers
Before you launch: rapids in Three Rivers
- Memory Isle rapids: a 1992 dam failure left rough rapids near the mouth. Scout first. The left channel runs the rapids; the right channel leads to a portage.
- Hidden hazard: paddlers report a large pointed object just under the surface in one chute. Scout before running anything.
- Downtown riffles: Class I and II water in downtown Three Rivers and Class I at the Moore Street bridge.
- Downed trees: the lower river is prone to trees blocking the channel.
River History
Three Rivers takes its name from the meeting of the Rocky, Portage and St. Joseph rivers, on Potawatomi land long before the town was settled in the 1830s. Mills and a dam grew up near the mouth of the Rocky as the town became a manufacturing center.
Parts of the river have been managed for trout since at least 1938. In 1992 the old dam near the mouth failed and washed out, leaving the rough water now called the Memory Isle rapids. The Cowling Road bridge, built in 1904, still crosses the river upstream.
River Map
River Overview
The Rocky River starts in southwest Marcellus Township, Cass County, and flows about 28 miles east and south through corners of Van Buren and Kalamazoo counties into St. Joseph County. It passes several small lakes and joins the St. Joseph River in Three Rivers. Flowerfield Creek, its largest tributary, roughly doubles its size.
Marcellus area headwaters
Small trout water near the source. The paddleable river begins near Marcellus.
Upper paddling section
Winds through a large marsh with very little development above Howardsville.
Howardsville and Bent Road
Site of the live USGS gage.
Null Road bridge
Boardwalk launch with a kayak slide. Good start for the lower river.
Lower river
Sandy bottom, clear water and some homes. Watch for downed trees.
Moore Street and downtown Three Rivers
Class I riffles at Moore Street, Class I to II water downtown.
Memory Isle rapids
Rough water left by the 1992 dam failure. Scout or portage.
St. Joseph River
The Rocky ends at the St. Joe in Three Rivers.
USGS Flow & Water Conditions
The USGS gage at Bent Road near Howardsville is in the middle of the paddling stretch and is the one to check. Summer flows are usually about 50 to 75 cubic feet per second, and floods near Three Rivers have topped 900.
How to read it
Compare today's flow with the typical flow for the date shown on the USGS graph. Well above normal means faster current, debris coming downstream and fewer safe eddies. Well below normal means more dragging and more liftovers.
After heavy rain, check again the morning you launch. Small rivers rise and fall quickly.
Higher water makes the Memory Isle rapids and downtown riffles pushier. Scout them every trip.
Paddling Character
Lower section
Clear and sandy
30 to 50 feet wide and 1 to 3 feet deep, with sand and gravel and slow to moderate current. Muddy banks make stops hard to find.
Three Rivers
Riffles and rapids
Riffles at Moore Street, Class I to II water downtown, and the Memory Isle rapids near the mouth.
Michigan Water Trails
The Rocky River is not a designated Michigan Water Trail. Nearby water trails include the Portage River and the St. Joseph River, both of which meet the Rocky at Three Rivers.
Check the official list for updates, since new trails are added over time.
Michigan Water TrailsDams & Portages
Three Rivers
Old dam site at Memory Isle
The dam near the mouth failed and washed out in 1992, leaving the Memory Isle rapids. Scout from shore. The right channel leads to a portage on the mainland, with no easy put-back point.
Plan ahead
Portage tips
Many paddlers end at the Conservation Park landing across the St. Joseph River. If you're not sure about Memory Isle, take out above it.
Launches
Listed upstream to downstream. Confirm parking, fees and current conditions before you go.
Upper river
Marcellus area access
The paddleable river begins near Marcellus. Scout public access before you go.
MapNorthwest of Three Rivers
Null Road bridge
Boardwalk with a canoe and kayak slide on the north side of the road, west side of the river.
MapThree Rivers
Conservation Park boat landing
Take-out across the St. Joseph River from the Rocky's mouth, near Scidmore Park.
MapCamping
Three Rivers area
Local campgrounds
Private campgrounds near Three Rivers make a good base. There's no camping on the river itself.
Wildlife & Fishing
Wildlife
The marsh on the upper river is great for herons, sandhill cranes, red-winged blackbirds and turtles. Deer, wild turkey and kingfishers are common downstream.
Fishing
The headwaters hold brown trout. The middle and lower river have smallmouth bass, rock bass, largemouth bass, bluegill and pike, some over 30 inches.
Safety
Safety essentials
- Wear your PFD the whole time.
- Scout the Memory Isle rapids and downtown riffles before running them.
- Watch for downed trees on the lower river.
- Take out at Conservation Park if you're not comfortable with the rapids.
Rules, passes and private land
- There's no state land along the banks. Get landowner permission before stopping on private land.
- A Michigan Recreation Passport is needed at state parks and many state-run launches.
- Much of the riverbank is private. Stop only on public land or where you have permission.
- Leave No Trace: pack out all trash.
What to pack
- Spare paddle, bilge pump, throw bag and whistle
- Dry bag with warm layers
- Map or GPS track with your take-out marked
- Helmet if you plan to run the Three Rivers rapids
Best Time & Access
Spring
Higher water makes the Three Rivers rapids pushier. Cold.
Summer
The best season. Comfortable flows and warm water.
Fall
Good color and fewer people.
Winter
Cold and icy. Not recommended.
From Grand Rapids, Three Rivers is about an hour and 30 minutes south on US-131.
Trip Planning
Classic run
Null Road bridge to Three Rivers, with a take-out at Conservation Park across the St. Joe.
Marsh paddle
The upper section above Howardsville is a quiet marsh paddle for beginners.
Three-river weekend
Pair the Rocky with the Portage and Prairie rivers, all close to Three Rivers.
Check before you go
Look at the Howardsville gage, and scout the Three Rivers rapids every time.
River Difficulty
We use the American Whitewater difficulty scale. American Whitewater doesn't list the Rocky River in Michigan, so the river is rated Class I. Local paddlers report Class I to II water in downtown Three Rivers and rough rapids at Memory Isle.
Upper marsh and Null Road to Moore Street
Easy water with some deadfall.
Downtown Three Rivers and Memory Isle
Riffles and rapids from the old dam site. Scout first; portage if in doubt.
Quick Reference
| Source | Marcellus Township, Cass County |
|---|---|
| Mouth | St. Joseph River in Three Rivers |
| Length | About 28 miles |
| Main tributary | Flowerfield Creek |
| Hazards | Memory Isle rapids from the 1992 dam failure |
| Main town | Three Rivers |
| Key gage | USGS 04097349, Bent Road at Howardsville |
| Michigan Water Trail | Not designated |
| Best season | May to October |
| Difficulty | Class I, Class I to II in Three Rivers |