 Pitt is a significant partner of the Confluence Project, a collaborative effort of Pacific Northwest tribes that stretches 450 miles from near the mouth of the Columbia River to the confluence of the Clearwater and Snake River in Idaho.Renowned artist Maya Lin, civic groups from Washington and Oregon, and other artists, architects, and landscape designers have also participated.Pitt designed a Welcome Gate for the river side of the Land bridge that reachers oars inset with glass masks honoring Chinook women.