This cache is on a trail of sorts. You will have to leave your watercraft to locate it.
There are many species of Sagittaria but all are perennial plants that have arrowhead-shaped leaves. Usually leaves have 3 points giving it the arrowhead shape but some are narrow and almost grass-like. Arrowheads can grow in shallow water or in wet areas. Leaves grow in clusters from the base and can be from less than a foot tall to over 4 feet. Leaf petioles are long, often spongy and have a milky-like fluid if crushed. Rhizomes can be extensive and some species have large tubers off the roots. Flowers are borne on separate stalks above the water in whorls of three and are usually white to light pink with three petals. Arrowheads spread rapidly by seeds and extensive rhizomes.