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CalTopo is great but the scanned maps really need to be cross-referenced to other more modern maps, which you can conveniently do with layers. It seems that half the roads on the old USGS maps don't exist anymore and many roads or trails have been built since then. But for topography, they can't be beat.
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.
Welcome All Jumpers! This is a Sister subreddit to the makeyourchoice CYOA subreddit. This Subreddit focuses specially on the JumpChain CYOA, where the 'Jumpers' travel across the multiverse visiting both fictional and original worlds in a series of 'Choose your own adventure' templates, each carrying on to the next...
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).
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. Later I found a print shop geared toward surveyors and architects and it was like $10 a pop for huge maps on tare and water proof synthetic paper.
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/
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.
The website was through usgs and the TNM. The website was kind of a salmon/off white colored scheme. On the site you could choose the state you wanted, select what scale of usgs maps (1:24:000). It would show you several pages of all the maps for that state you could download as a geopdf for every quad in that state.