Past the front entry, there are a series of steel panels commemorating various river-related events, such the one below.
The statue itself, designed by Norma McClory and made of Monsanto fiberglass, was dedicated in 1957. Various Biblical passages relate to the Virgin and Christ’s life, such as the Star of Bethlehem and the Baptism of Christ, which are visible below.
One the other side, the one on the left refers to the appearance of the Holy Spirit as a dove at Christ’s Baptism, and the one on the right references the Apocalyptic Woman, generally interpreted by theologians to the be the Virgin Mary.
I can’t help but see the influence of the Christ the Redeemer statue in Rio de Janeiro in the design and form of Our Lady of the Rivers, the former being built several decades before the latter.