Marsden Manson


Marsden Manson


John Muir



801 Union Trust Biog

July 29th 1907.

My Dear Prof Muir

Your letter of the 26th inst is just received It is not possible for me to give you maps of the reservoir, but I can give you a full description each. In Lake Weaver the dam will be about 1/4 to 1/3 mile below the out-let of the present [lake?] & the surface of the lake when the [dam?] is full during all months except late Sept. Oct Nov. & Dec. will be about 1 1/2 greater than present area. In Hetch Hetchy the dam will be in the gorge at lower end of valley and will back water nearly 3 miles with an average moth of about 1/4 mile covering I think 1700 acres. The maximum height will be nearly to the base of the falls on the north wall. The lake will be full or nearly so during those months when the mountaineer can visit the region. The dams should be of [rustic?] [illegible] faced masonry & practically a part of the enclosing walls, in no way det[illegible]ing from the surroundings & not reaching with b[illegible] water the great canon [diacritic] which is the feature of the region.

Sincerely yours

Marsden Manson.



San Francisco

Date Original

1907 Jul 29


Original letter dimensions: 28 x 21.5 cm.

Resource Identifier


File Identifier

Reel 16, Image 0851

Collection Identifier

Online finding aid for the microform version of the John Muir Correspondence

Copyright Statement

Some letters written to John Muir may be protected by the U.S. Copyright Law (Title 17, U.S.C.). Transmission or reproduction of materials protected by copyright beyond that allowed by fair use requires the written permission of the copyright owners. Responsibility for any use rests exclusively with the user.

Owning Institution

Holt-Atherton Special Collections, University of the Pacific Library. Please contact this institution directly to obtain copies of the images or permission to publish or use them beyond educational purposes.


1 page


Environmentalist, naturalist, travel, conservation, national parks, John Muir, Yosemite, California, history, correspondence, letters



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