Glacial Lake Missoula and Its Humongous

The story of colossal Ice Age floods that reshaped the Northwest and fostered new geologic thought.When geologist J Harlan Bretz walked the dry scabland channels of eastern Washington in the 1920s, he realized he was viewing a landscape sculpted by wate

Preface

vii

Introduction A Glacial Lake, the Fertile Palouse Hills, the Barren Scablands

1

(6)

Truly an Inland Sea

7

(4)

Glacial Lake Missoula

A Window into the Past

11

(4)

A Visit to Glacial Lake Missoula

A Heretic in the Scablands

15

(6)

J Harlen Bretz and His Humongous Flood

Where Did the Water Come From?

21

(2)

J. T. Pardee Returns to Glacial Lake Missoula

Hard and Distinctive Bedrock

23

(2)

Belt Rocks

The Once and Repeating Ice Dam

25

(8)

Several Dozen Lakes

Setting the Stage for the Big Spectacle

33

(4)

The Little Bitterroot Valley

A Question of Scale

37

(4)

The Giant Ripples of Camas Prairie

A Most Extraordinary Basin

41

(8)

Rainbow Lake

Ice, Water, and a River

49

(10)

The Mission Valley, the Jocko Valley, and the Flathead River

The Unscathed Valleys

59

(6)

The Bitterroot and Missoula Valleys

The Tightest Squeeze

65

(8)

Hellgate Canyon and the Saddle North of Mount Jumbo

The Water Route to Paradise

73

(8)

Down the Clark Fork River to the Flathead River

Taking the Measure of the Drainage Currents

81

(6)

The Clark Fork River between Paradise and Sandpoint

Gateway to the Scablands

87

(8)

Rathdrum Prairie

Floods of Basalt

95

(4)

Lava Flows and Crustal Arches

Moses Coulee

99

(10)

Okanogan Ice and Glacial Lake Columbia

The Grandaddy Scablands

109

(6)

The Cheney-Palouse and Telford-Crab Creek Floodways

Regulating Glacial Lake Columbia

115

(8)

Grand Coulee

The Shortcut to the Snake River

123

(6)

The Palouse River, Palouse Falls, and Washtucna Coulee

The Gathering of the Waters

129

(4)

Beyond the Cheney-Palouse Scabland

The Grand Emptying

133

(10)

Floodwater Exits the Quincy Basin

A Patchwork of Valleys

143

(4)

Lake Lewis

The Archives of the Floods

147

(4)

The Touchet Formation

The Way West

151

(8)

Through Wallula Gap and into Lake Condon

Another Tight Squeeze

159

(8)

The Columbia Gorge

A Sudden Rush of Water

167

(4)

Scouring through Portland

The Inland Bay

171

(6)

Floods in the Willamette Valley

The Last Lap

177

(2)

On to the Pacific Ocean

Dusting Off the Crystal Ball

179

(2)

Could It Happen Again?

Epilogue

181

(2)

Glossary

183

(2)

Selected Bibliography

185

(8)

Index

193

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Glacial Lake Missoula and Its Humongous Flood: And Its Humongous Floods

Summary

Table of Contents

Supplemental Materials