Ontonagon - Hwy.45 to Ontonagon (20 miles)


Ontonagon, Michigan, US

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Hwy.45 to Ontonagon (20 miles)

Usual Difficulty I(II) (for normal flows)
Length 20 Miles
Avg. Gradient 3 fpm

Gauge Information

Name Range Difficulty Updated Level
ONTONAGON RIVER NEAR ROCKLAND, MI
usgs-04040000 500 - 5000 cfs I(II) 01h31m 740 cfs (running)
Likely good boatable flows. (We need your comments and reports to refine description and recommended flows.) Cited gauge (1,340 sq.mi. drainage) is right at the put-in for this reach, therefore should very accurately represent flows in this reach.


River Description

Canoe tripping run (20 miles, at only 3 FPM average gradient). It may be possible to shorten the run a bit using alternate accesses.

"Grand Rapids" (at Lat/Lng 46.7640, -89.2717) is the whitewater highlight of the run.

USGS aerial image resolution on Google is quite good. Go to the 'Map' tab, click 'USGS Aerial', and double-click near (not 'on') any of the markers on the river (put-in, take-out, or Grand Rapids), then zoom in to maximum resolution, and do a 'virtual walk' of the river.


StreamTeam Status: Not Verified
Last Updated: 2009-02-21 08:37:27

Rapid Summary

Mile Rapid Name Class Features (Legend)
0.0Grand Rapids

Rapid Descriptions

Grand Rapids

This is the only marked, named rapids on this reach. We have no specific information on the nature of this rapids. However, from the 'Map' tab ('USGS Aerial' view, zoomed in to maximum resolution) it appears to be an area of rubble shoals, leading to an island (making for some likely 'constriction waves').




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