Adequate brook trout spawning and nursery areas are also present. Natural reproduction is occasionally supplemented with hatchery salmon. Spawning and nursery areas are available for salmon in both the Fish River inlet and outlet.

However, efforts continue to emphasize the management of Portage Lake as a salmon and brook trout lake.

As a result, the water quality conditions are considered marginal for cold-water game fish.

In fact, the water temperatures are about equal at all depths during the warm summer months. Due to its shallow average depth, Portage does not separate into warm and cold layers. Since 2001, the lake has been marked with navigational buoys by the Portage Lake Association. A public boat landing and beach is available in the town of Portage. Development on Portage Lake is considered heavy and it includes seasonal as well as year-round residences. At 2,474 acres, this moderately sized water body receives ample use by various outdoor recreation enthusiast. With a maximum-recorded depth of 25 feet, Portage Lake is one of the two shallowest lakes in the Fish River chain of lakes.

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