2015-07-22_REVISION - M1979205

• Permit No: M1979205
• IBM Index Class Name: REVISION
• Doc Date: 7/22/2015
• Doc Name: Follow up TR03
• From: Greg Lewicki & Assoc
• To: DRMS
• Type & Sequence: TR3
• Email Name: DMC
• Media Type: D
• Archive: No

GEOSCIENCESERI 7CES Peter Kearl M.S.
December 22, 2014
Mark Gilfillan
U.S.A.C.O.E.
Sacramento District
400 Rood Avenue, Room 123
Grand Junction, CO 81501
RE: 2014 Annual Monitoring Report for the Colorado River near Rifle Regulatory Division
SPK -2012-00125
This report fulfills the permit requirements of Special Condition 8 to monitor the river bank
stability and sediment transport for the Chambers Pit river restoration and reclamation project
on the Colorado River near Rifle, Colorado under Permit SPK -2012-00125. This is the last
Annual Monitoring report required under the permit. The major components of the monitoring
include surveys of the bank and structure stability plus visual and photo documentation of
structures and excavated areas.
The site survey was conducted on December 9` of this year and included monitoring of the
upstream J -hook (Structure 4), structures located on the Chambers property (Structure 5),
downstream structures (Structure 6) and the design channel (Structure 3). Please refer to the
Reclamation Plan submitted with the original application for locations of the structures.
During the 2014 spring runoff, the Colorado River peaked at nearly 24,000 cfs or well above the
bank -full flow of 12,700 cfs. In other words, flood conditions occurred at the site during the
2014 spring runoff. An aerial photograph (Figure 1) shows the extent of flood waters.
Compared to the 2012 and 2013 runoff years, this year's flood flow placed significant stress on
the bank -stabilization structures. There were impacts resulting from flood flows that include
damage to bank stabilization structures and significant deposition of sand and gravel in the
river channel that was excavated in 2012 (design channel).
Permit conditions require sediment transport and bank stability surveys. As reported in past
annual reports, it has not been possible to obtain reliable cross-sectional data to evaluate the
rate of deposition in the river channel. Regardless, this year's spring runoff visibly filled the
excavated channel with sand and gravel. Figures 2 and 3 show the gravel bar recently
deposited in the location of the excavated channel from upstream and downstream views,
2263 Kinbston Road I Grand Junction, CO 81507 1 [phone] 1 peter. kearlcnr�hotmail. com