River Valley Estate is a private 23± acre live-water tract on the South San Gabriel River with ~1± acre of buildable area outside the floodplain and private, gated access on River Run. This stretch enjoys ~650± ft of pristine frontage with clear pools and steady flow fed by springs a few thousand feet upstream, and it sits upstream from the famed Leander Dinosaur Tracks. Recent improvements include major cleanup with brush/underbrush mulched and cleared, opening view corridors while preserving massive native trees. The land gently rolls to an oak mott and natural clearing that reveal the river; a deep pool on the north side anchors swimming, paddling, and fishing, and the river is usable for hundreds of yards in either direction. Raw river tracts of this size and quality on the San Gabriel are rare—an exceptional canvas for a luxury homesite or private retreat (buyer to verify buildable areas, utilities, and constraints).