Mann Lake is a 136.3-acre irrigation lake located in Nez Perce County, Idaho. The lake features a boat launch area that provides access for paddlers, though parking and facilities are basic.

The lake sits in proximity to the Snake River and Hells Canyon region, offering views of the surrounding landscape. For paddlers seeking overnight stays, camping is available at Upper Hog Island near the lake. The primary access point is via Mann Lake boat launch, which serves both motorized and non-motorized watercraft.

As with all Idaho waterways, paddlers must follow state regulations including having a Coast Guard approved life jacket for each person (required to be worn by those 14 and under), carrying a whistle, and displaying an Idaho Invasive Species Sticker on non-motorized vessels 10 feet or longer. After sunset or during restricted visibility, vessels must be able to exhibit a white light or lantern.

Mann Lake sustains a fish population and makes an ideal destination for day trips, with protected status affecting some areas - fishing is not permitted within posted upstream and downstream boundaries of any fish weir or trap.

While the lake serves primarily as an irrigation reservoir, its location near several regional attractions including Hells Canyon Resort & Marina and the Snake River provides opportunities to combine paddling with other outdoor activities. The proximity to Lewiston offers convenient lodging options for visitors planning multi-day trips to the area.