<p>The staff at the U.S. Army Corps of Engineers' Dworshak Dam and Reservoir will offer free powerhouse tours 10 a.m.-3 p.m. Saturday to celebrate the dam's 40th year of operation. Tours will start each half-hour, beginning at the Dworshak Dam powerhouse entrance at the base of the dam at 1428 Northfork Drive in Ahsahka, Idaho.</p><p>Photo identification is required for all adults. Purses, handbags, camera bags, diaper bags and backpacks are not allowed inside the powerhouses and should be left in visitors' vehicles. Limited photography will be permitted only in designated areas.</p><p>kAmu@C :?7@C&gt;2E:@?[ 42== Wa_gX cfe`add]k^Am</p><p>2013 Moscow-Pullman Daily News. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.</p><p><a href="http://dnews.com/local/article_ec451bed-5eae-55f3-a39d-a777a45f6f33.html">Keep reading...</a></p>