I believe the Timeline Mural off Sel Peacock Drive in Henderson was completed last year. I know it's taken me quite a while to get around to seeing it, to take some shots for the blog, since first being told about it.
It's in a bit of a "blink and you'd miss it" place, right beside WINZ (now one of those Community Link centres), leading toward the banks of the Opanuku Creek, opposite the Mill Cottage reserve, just over the bridge.
It does give a good graphic summary of history from the original stream, through to Henderson's Mill, urbanisation ...
... and more recent efforts to clean up the stream so that wildlife can return.