Piece 4 of 12: Lake Mathews Traditional Cache

This is Piece 4 of a series of 12 puzzle piece caches that I am hiding all across Southern California! Each cache contains a different piece and when you have obtained them all, you can assemble them into a custom-made puzzle. Please feel free to take one puzzle piece, and leave the rest for others! This particular piece is hidden directly opposite the Mathews Dam Founders Monument in Riverside County. This one is a quick park and grab; all you have to do is quickly park along the shoulder of the road and retrieve the cache. The coordinates should be pretty accurate; note which side of the road it is on. If the pieces are running low or the cache otherwise needs maintenance, let me know and I will address it as soon as possible. Below is a picture of ground zero to give you a bit of a hint. Enjoy the view!

Below are the links to the other pieces of the puzzle.
GCAYWT2 - Piece 1 of 12: Icehouse Canyon Trail
GCAYY96 - Piece 2 of 12: Mormon Battalion Peak
GCAZF47 - Piece 3 of 12: La Loma Hills
GCAZF64 - Piece 4 of 12: Lake Mathews (you are here)
GCAZPN3 - Piece 5 of 12: Maple Springs Trailhead
GCAZPQ7 - Piece 6 of 12: Serrano Ridge Trail
GCAZYFB - Piece 7 of 12: Westminster Park
GCAZYFH - Piece 8 of 12: Caruthers Park
GCB087Y - Piece 9 of 12: Ascot Hills Park
GCB0EEE - Piece 10 of 12: Echo Mountain
GCB0FYR - Piece 11 of 12: West Fork, San Gabriel River
GCB0FZJ - Piece 12 of 12: Marshall Canyon Staging Area