WSP04101

• File Number: 8080
• Description: Section D General Interstate Litigation - Rainbow Bridge Monitoring Program
• State: CO
• Basin: Statewide
• Date: 5/21/1964
• Author: DOI-BOR
• Title: Rainbow Bridge Monitoring Program - Reports 4 through 10
• Water Supply Pro - Doc Type: Report/Study

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Bureau of Reclamation Denver laboratory. A second group of rock samples

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from Rainbow Bridge were also'analyzed for moisture content.

Fourteen detailed geologie sections of Bridge Creek Canyon were reviewed
and resurveyed for accuracy. Copies of these sections are provided in
Appendix "A," of this report. A survey location map, No. 557-400-231,
depieting the quadrilaterals, sediment seetions, and photographic
stations is also ,included in this appendix.

Photographs No. P557-427-697UA and P557-427-7l0A are provided in
Appendix "A" to orient the reader on the location of the Whittemore
Strain Gage Stations and Micrometer Station No.5. A set of diagrams
explaining these instrument installations are included.

SPECIFIC SUBJECTS

The following data are relevant to this reporting period:

1. Bridge Creek Canyon Quadrilateral Surveys

Quadrilaterals: A third set of precise lateral canyon measurements

were made through the Quadrilateral systems A, B, and D. The results

show no movement between surveys taken during the initial cycle prior

to, during, and after retreat Of the, reservoir.

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2. Rainbow Bridqe Elevation Surveys
Five sets of precise elevation surveys have been obtained to date through
the Quadrilateral system C. The results show a relative drop from the
rise in e levati on recorded in the previ ous surveys. Thi s reflects the
seasonal return to colder temperatures and significantly points to the

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