BOULDER’S WATERWORKS

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110 Above, two 400 rpm GE 10 Mw synchronous generators were installed in 1936 to replace the original units (see preceding page). This generator (“Unit A”) is no longer functional, but it remains in the Boulder Canyon Hydro Plant for historic preservation. (The other unit was replaced in 2012.) Below, the overhead crane dates from 1910. Pettem photos, 2013
Repair of the Barker Gravity Line Following the purchase of the Boulder Canyon Hydro Project, the City quickly embarked on a program to repair the Barker Gravity Line. At the time of the purchase, about 10 per cent of the water entering the inlet to the pipeline leaked before reaching Kossler Reservoir. A survey of the pipeline was done in 2001 to identify access roads and assess the pipeline's condition. This led to an on-going maintenance program for replacement and repair of pipeline sections beginning in 2003. The pipeline runs through dense forest and rugged mountain terrain. Access for maintenance and repair is difficult and requires All Terrain Vehicles. Most of the work involved stabilizing the pipe bench that keeps the pipeline perched on the side of mountainous slopes as it winds its way along the ridgeline high above Boulder Creek. Maintenance also involved replacing some of the steel pipe sections in the seven siphons across valleys. Access to the project required a combination of existing historical access roads constructed in 1910, as well as helicopters for transporting steel pipe. Another assessment, done in 2008, found that the most serious defects had been addressed. However, the concrete in the pipeline was more than 100 years old and showed its age. 202 Left, this 1910-era photograph shows the Barker Gravity Line under construction. Above, in 2012, steel pipe was used in the repair of one section of the pipeline. Both photos, courtesy City of Boulder 111
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BOULDER’S WATERWORKS PAST & PRESE
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BOULDER’S WATERWORKS -- PAST & PR
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• Water System Security Improveme
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INTRODUCTION The story of Boulder
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SETTLEMENT& DITCHES Boulder City To
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1859, they dug small ditches from B
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“Shovel diplomacy,” however, di
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state senator. In January 1873, the
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PUBLIC WATERWORKS & PROBLEMS • 18
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Above, the Town of Boulder Reservoi
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BOULDER’S EARLY WATERWORKS PRESEN
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Ditch laterals paralleled 12th Stre
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A few weeks later, the City Council
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Silver Lake Ditch had five wooden f
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NEED FOR NEW RESERVOIRS • 1891, O
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Continued population growth in Boul
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In Boulder, laborers replaced pipes
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INTO THE 20TH CENTURY Discovery of
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In 1904, glacier hikers even includ
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The Maxwells also made a similar pr
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LAKEWOOD, LAKEWOOD RESERVOIR & TUNS
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In addition, the City acquired ease
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The Act that conveyed the first gra
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BOULDER HYDRO SYSTEM, 1910 The twen
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The dam was photographed on April 1
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producing 5,000 kilowatts (KW) of p
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On August 4, 1910, a ceremony was h
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This drawing of the original two ge
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ADDITIONAL WATERSHED DEVELOPMENTS A
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Silver Lake Pipeline In the years p
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pieces, are we justified in denying
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The WPA built much of Boulder’s w
Page 65 and 66: mission lines which, in places, has
Page 67 and 68: older clay tile pipe on the pipelin
Page 69 and 70: NEW WATER SUPPLIES & GROWTH, 1950s-
Page 71 and 72: One of the surge chambers for the p
Page 73 and 74: At this time, Boulder was beginning
Page 75 and 76: The City entered into an agreement
Page 77 and 78: Beginning in 1947, CBT Project wate
Page 79 and 80: The next water rights used to fill
Page 81 and 82: Atmospheric Research’s proposed b
Page 83 and 84: BETASSO WATER TREATMENT PLANT, 1964
Page 85 and 86: A new raw water pipeline was constr
Page 87 and 88: In 1976, the Betasso Water Treatmen
Page 89 and 90: 83
Page 91 and 92: BOULDER RESERVOIR WATER TREATMENT P
Page 93 and 94: Throughout the 1970s, employees of
Page 95 and 96: WATER AND POWER FOR THE FUTURE, 198
Page 97 and 98: In 1989, roller-compacted concrete
Page 99 and 100: pressure zone into the lower zone.
Page 101 and 102: costs would rise to $999,000. Hartm
Page 103 and 104: DEVELOPMENTS IN THE 1990s From the
Page 105 and 106: Reconstruction of Silver Lake Pipel
Page 107 and 108: water shortages should occur. The c
Page 109 and 110: Water Treatment Plant improvements
Page 111 and 112: The dispute escalated when the City
Page 113 and 114: TWENTY-FIRST-CENTURY PROGRESS As th
Page 115: Meanwhile, the City wanted to gain
Page 119 and 120: Lakewood Pipeline reconstruction Bu
Page 121 and 122: struction of the Lakewood Pipeline
Page 123 and 124: the pipe manufacturer for enough mo
Page 125 and 126: sions, City staff surprised themsel
Page 127 and 128: Dealing with Drought In April 2002,
Page 129 and 130: PREPARING FOR THE FUTURE Boulder is
Page 131 and 132: Boulder Feeder Canal, and that was
Page 133 and 134: Problem 3 - Discharging water back
Page 135 and 136: Above, a new generator and turbine,
Page 137 and 138: The Feeder Canal would require repa
Page 139 and 140: APPENDIX Recent Water Utilities Wor
Page 141 and 142: ENDNOTES 1 The word “Arapaho” c
Page 143 and 144: 35 Daily Camera, October 20, 1891.
Page 145 and 146: 71 Deed between The Cashier Mining
Page 147 and 148: Supply, April 2009, pages 3-10. 104
Page 149 and 150: 135 Preliminary Design Memorandum,
Page 151 and 152: 167 The Windy Gap Project, Municipa
Page 153 and 154: 198 City of Boulder Utilities Repor
Page 155 and 156: 149
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BOULDER’S WATERWORKS

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