I added a set of arroyos in New Mexico using USGS quadrangle sheets, which originate from digital elevation models and ground surveys in the 1980s. They're tagged as "intermittent streams" in OSM. There's a lot more work to do outside the national forests and major cities. One thing I noticed is that the dry beds shape road and settlement patterns, beyond just being useful for navigation.
NM is undermapped relative to other states. I've wondered if this has to do with the complex governance and land claims (which can make it difficult to do bulk data imports).
NM is undermapped relative to other states. I've wondered if this has to do with the complex governance and land claims (which can make it difficult to do bulk data imports).