The Stanislaus Forebay is part of the Spring Gap/Stanislaus Hydroelectric Project, which is owned and operated by PG&E. The forebay and surrounding area is open to the public for recreational opportunities, namely fishing or exploring, however, the forebay is closed to boating and swimming.
The forebay is fed by the 11.4-mile-long Stanislaus Power Tunnel which originates at the Middle Fork diversion dam near Spring Gap and the Sandbar Flat Campground. Access to the forebay is off Parrotts Ferry Road via Camp Nine Road and Forest Route 3N03. An alternate route is through Columbia to Italian Bar Road to Forest Route 3N03. For the second route you must cross through Knight Creek so it is best not to take this route during periods of high water. Forest Road 3N03 is a rough, rocky road so plan on taking a high-clearance, preferably 4wd vehicle, or my personal favorite a dual sport.
One final note is if you want to take Forest Route 4N05 don’t bother. This forest road has not been maintained and is blocked by debris about 1/2 mile in from the forebay site and is also gated at the other end, i.e., junction with 4N04. This would-be road does however provide some amazing views of the Middle Fork Stanislaus River Canyon.