Wow, this took me a long time to get through, most of the summer. Though this did include a major 8-week road trip across the USA, stopping in a few places that the expedition passed through, most notably St. Lewis. While it was fascinating to read the words (somewhat edited in this edition for ease of reading and to great effect because the text by and large flows very well.) of Lewis and Clark as they were written, this is ultimately a journal of their expedition, not a novel. As such it reads practically and provides all sorts of factual detail but at the cost of sacrificing narrative flow. With that said, both captains wrote tolerably well, and the expedition's day-to-day happenings are usually interesting enough to keep the reader engaged. Some of the entries from the plains sections of the expedition were boring and grim to read as the party struggled upstream against the river and the elements, but this adds to your appreciation of the challenge too.
I loved getting a first-hand account of the western states before America's westward expansion. It was amazing to read about the abundance of wildlife, the biodiversity of the untainted flora, the changing landscape and the amount of native American Indian tribes present in these areas before white settlers arrived in force. Interesting to compare the response of the indigenous people to the expedition when they first encountered them and for trading purposes. Some tribes and nations were extremely friendly and hospitable, some were distrustful and wary, and some took advantage of the trading opportunities, driving a hard bargain.
Overall, this was a long read, and while tedious at times, as it's almost as good as a primary source, it is ultimately very interesting and valuable. The summarised chapters are much easier to read and understand as they provide context for the current events and status of the expedition. I preferred these sections to the core text. More maps and pictures would have been nice too. The single map provided at the start was sometimes impractical for placing the party at points in their expedition, and I found myself vaguely guessing where they were. While I will not read this edition in its entirety again, I'm glad I read it the first time around. Next time a briefer overall summary text or documentary will suffice for me.