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Last summer I imported 16,000+ USGS gaging stations into OpenStreetMap. Not content with a one-time import, I built a tool to keep the data up-to-date going forward. I've published a writeup of the project over on my portfolio: waysidemapping.org/projects/usg...

USGS's streamgages provide critical public data about the state of our lakes and rivers. They're also used by paddlers to plan safe, enjoyable trips. Mapping them accurately in OpenStreetMap allows any app using OSM to easily incorporate gage information

To complete the import, I wrote a series of open source scripts to fetch and conflate USGS data into OSM. These can be re-run at any time to keep the data in sync without overwriting hand-mapped data