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r/Ultralight. r/Ultralight. r/Ultralight is the largest online Ultralight Backcountry Backpacking community! This sub is about overnight backcountry backpacking, with a focus on moving efficiently, packing light, generally aiming at a sub 10 pound base weight, and following LNT principles.
Today, these topographic maps in question (Spirit Lake, Cougar, Elk Rock, Mount St. Helens and Toutle) are freely downloadable from the USGS National Map's TopoView web utility. I have subsequently downloaded all five of those maps, and thankful for being pre-georeferenced, they loaded with ease in QGis without any conflict to the pre-eruption DEM.
Click on the + next to the maps you want to download to add them to your "cart". I've found that downloads only work correctly if you have less than ~35 MB in your cart. Otherwise the download won't include all of the maps you added. So you may have to download your maps in several steps.
I would also recommend a combo of the National Geographic line of maps of california - they are excellent for trip planning and emergency backup, and then pair that with a phone-based map software like backcountry navigator pro or caltopo (each about $10).
topoBuilder- custom USGS Topographic Maps on demand. So I actually happened upon the new site on day 1 from a Google search. It was snappy and performed well for a couple hours. A couple hours later I posted it in a forum and everyone said that the site wouldn't work properly.
The USGS has full topo maps of numerous scales of just about every area in the US. Go to USGS.gov -> maps -> topographic maps. I downloaded some USGS maps onto a flash drive and took them to a local copy shop. They wanted my first born child to print them in color on large format paper so I almost gave up.
For downloading USA topo maps I primarily use the USGS 'National Map Downloader': https://viewer.nationalmap.gov/basic/ You can also use the USGS 'Earth Explorer' to browse other georeferenced data like aerial imagery, digital elevation models (DEMs), satellite imagery, hyperspectral scans, etc: https://earthexplorer.usgs.gov/
159K subscribers in the Maps community. Beautiful, interesting, and informative maps.
If you want straight up topographic maps, this is it. For pretty well updated maps with trails, I like Sky Terrain trail maps. The two can often complement each other well, with the USGS maps having more detail, and the Sky Terrain having more trails and descriptions.
Otherwise if a map isn't available or you're out in county you have to use the 1:25,000 USGS maps available on the site Windflower posted, as there usually won't be anything better. Not sure what a growth map would be but the USGS site has historic images.