This plaque is at the Mount of the Holy Cross Overlook, also known as Julia's Deck, on the Shrine Pass Trail. Shrine Pass Road [FSR 709], a maintained dirt road, connects Vail and Red Cliff
The first section is Psalm 104:24 and the prayer following is unattributed. Interestingly enough, these same quotations are on plaques at the Grand Canyon and the Bronte Waterfall (England).
O Lord,
How manifold
are Thy works!
In wisdom hast
Thou made them...