I was deeply influenced by Kelley's early works on hydraulic mining in the 1950s (his book Gold vs. Grain and his papers such as the Forgotten Giant: ...Hydraulic Mining...). I also heard strong praise for this book from many water professionals in the Sacramento Valley. As I eagerly read this book, therefore, I expected more of the same: a study of the massive impact that hydraulic mining sedimentation had on California rivers, flooding, and politics in the late nineteenth century.
Fortunately - I was surprised to learn - Battling the Inland Sea (BIS) goes well beyond the physical and political effects of historical sedimentation in several important ways. This book is much broader in its geographic extent and substantive scope than Kelley's earlier works. Geographically, mining sediment primarily impacted the lowermost Sacramento River (below Fremont Weir) and its Sierra Nevada tributaries (especially the Feather, Yuba, Bear, and American Rivers). BIS is more broadly concerned with flood control in the Sacramento Valley up into and beyond the extensive Colusa and Butte Basins which had relatively little impact from mining sediment. Moreover, the emphasis of the discussion in BIS is on the history of flood control efforts in the Valley and the surrounding political culture of flood control. Although these topics are inseparable from the mining sediment issue in some areas, it is a much broader topic involving a set of deeper issues. In fact, Kelley makes it clear from the outset that the Sacramento Valley was prone to extensive flooding and that the natural river channel was incapable of conveying but a small fraction of the flow during large floods; long before mining sediment arrived. This emphasis is key to understanding the importance of BIS to educating both professional river managers and the lay public to the actual flood risks in the Valley. The long history of flood control in the Sacramento Valley represents a fight against nature. Mining sedimentation is a complication that exacerbates an already intractable flood-prone situation, but it is not the primary cause of flood risk. Extensive low-lying basins are the inherent cause for concern.
The common ground between BIS and Kelley's earlier work is that he, again, presents an inspired historical overview of the political culture underlying California water politics. The complex developments of the period are put into a context of shifting ideologies of resource management, perception of nature, and the vagaries of politics and economics.
I strongly recommend this book to anyone interested in these broader topics. It is, of course, a must-read for students of California flood-management history.
Allan James
Geography Department
University South Carolina