Splake is news to me, but maybe MMDON knows. Walleye, yes. Game department has been netting in the spring to try and keep them under control. Rumors of 20-24 inchers in Ririe. Walleye are on the upper end. 20-25 min run from the dam in a faster fishing boat. Slow down in the S curves and live to fish another day. thumbsup
You can Launch at Blacktail, which is east of I.f. Easy to see on the map. Kokanee and trout the full length of the reserviour except on the very north end. Have to look for them on the fish finder to find schools.
Species in the reservior are Brown, Rainbow ( triploid) and Cutthroat trout; small mouth bass, Walleye and Kokanee. Fee at both ends to launch. Nice ramps at blacktail. $5.00 there. Annual $60.00
Happy Fishing