No matter what the advertisements might say, there is no official end to summer. Labor Day is the marker for most while the more meteorological types wait until the autumnal equinox. Whatever your definition, summer is on the decline but there's still plenty of time to take advantage of a terrific late summer fishing pattern for smallmouth bass.
For some reason, a lot of anglers think summer fishing means hitting the lakes and ignoring the rivers. River fishing is great in the spring and fall it is also a great place to fish throughout the summer and especially in late summer when weather patterns are known to be unstable. Rivers just seem to have a more consistent bite and cold fronts don't impact them as much.
The smallmouth bite can be hit or miss and the fish are very temperamental making it tough to get a bite some days—the bass are easier to find in the river or any reservoir system.
One of my favorite stretches of river is found close to my home in Elk River north to Monticello. I also really like the stretches around Sartell and the one between Royalton and Little Falls.
These are known as world-class smallmouth waters but are often devoid of fishing boats, even on the weekends. Pleasure boaters can be found on these stretches throughout the weekend but they receive very little fishing pressure for the quality of catch they produce. The patterns on these stretches for smallmouth bass can be applied to any similar body of water around the state such as the Rum and St. Louis.
The places to look are where you find the fastest current, big boulders and sporadic weeds. The river flow is like a continuous buffet line and the smallmouth sit in these stretches just waiting for food to come down the current into their mouth.
On the Mississippi River's Sartell stretch, the water is the deepest and slowest of all the pools with steep banks, lots of shoreline with overhanging trees and slow moving water. River stretches like this are ripe for fishing weightless plastic lures with an oversized hook.
The reason for an oversized hook is because it acts as a weight for the plastic allowing an angler to twitch the lure under the surface of the water in a walk-the-dog retrieve.