The water level along stal̓əw̓ rises and falls in complicated ways, hiding and revealing this sandbar. It’s a good place for seagulls and crows (sometimes great blue herons!); though if humans tried to walk on this, their legs would sink 3 feet into the mud.
The City of New Westminster built a wooden boardwalk along this northern bank decades ago, & if you take pictures from the edge of that thing you can almost make it look like a screen from some point & click adventure game! (Maybe one where you play as a bird.)