Ken-ichi Ueda on Mythryl: “Making waterway networks from OSM data is one of the more fun recent…”

Making waterway networks from OSM data is one of the more fun recent features in underfoot.rocks. The National Hydrography Dataset is great, but it doesn't cover culverted creeks very well, and they're some of the more interesting urban hydrological features.

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@openstreetmap.bsky.social waterway data for certain packs (currently just the SF Bay Area). More complete than the NHD for culverted urban creeks (though probably less complete in more data-sparse areas). Here's a trace from Lake Temescal to the Bay in Oakland, CA, which is mostly underground.

26/10/26, 7:11 pm1 repost5 likes

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