Grand Valley, CO
This project involved making a street map for the entire developed portion of the Grand Valley, which includes the cities of Grand Junction, Palisade, Fruita, and the unincorporated areas in between. Mesa County had all kinds of GIS data layers available, and fortunately it was pretty high-quality stuff...
...but nevertheless I ended up with hundreds of discrepancies and questions, so I went and did three days worth of field-checking in order to resolve those. I added a shaded relief layer, which I think really improves the appearance of the map: