Greenway Foundation Photos.    Since 1974, the Greenway Foundation has led the effort to enhance and preserve the South Platte River. Over the last three decades, over $60 million of environmental and recreational amenities have been added to these valuable natural resources. Annual programs: Confluence Concerts, Reception on the River, River Flicks, Venice on the Creek.    Click here to see DigPicPhotos images on the Greenway Foundation's website.