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<br /> Bedrock <br />Reach Rock type at river Upstream end of Reach length resistance <br /> level reach (Rkm)l (km) class2 <br /> Uinta Mtn. Group 579.5 22.7 9 <br />Lodore Lodore Formation 556.8 2.4 8 <br />Canyon Madison Limestone 554.4 1.4 8 <br /> Paleozoic undif. 553.0 0.3 7.5 <br /> Weber Sandstone 552.7 1.6 6 <br />Echo Park Weber Sandstone 551.0 3.2 6 <br /> Paleozoic undif. 547.8 0.5 7.5 <br />Whirlpool Uinta Mtn. Group 547.3 2.4 9 <br />Canyon Lodore Formation 544.9 5.2 8 <br /> Madison Limestone 539.8 4.3 8 <br /> Paleozoic undif. 535.4 1.8 7.5 <br />Island Park Mesozoic undif. 533.7 11.6 3-5 <br /> Paleozoic undif. 522.1 4.0 7.5 <br />Split Madison Limestone 518.0 3.4 8 <br />Mountain Paleozoic undif. 514.7 2.1 7.5 <br />Canyon Weber Sandstone 512.6 2.4 6 <br />1 Distances are in kilometers upstream from Colorado River confluence. <br />2 Adapted from Harden, 1990. <br />