Interestingly, no mention of springs! I suppose that any official is going to think of a spring as a stream though.
Keep searching the Federal Register for the Short Title "Clean Water Restoration Act".(C) all other waters, such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds;