Water Conservation

Middle Ranch Reservoir

Aerial view of the Middle Ranch Reservoir
The Middle Ranch Reservoir, also known as Thompson’s Reservoir, is the main gauge for assessing the fresh water supply conditions for Santa Catalina Island.

The measured water level triggers the different stages of water conservation and rationing as laid out in the Schedule 14.1 tariffs.  For more information regarding water on Catalina visit: www.sce.com/catalina.

If you have any general questions, a dedicated Catalina customer service representative can assist you at 1-800-367-8851 (Monday through Friday 8:00 a.m. to 5:00 p.m.).

Collaborations and Resources

Catalina Island Water System Drought Contingency Plan (PDF)

Middle Ranch Reservoir Capacity (approximate) and tariff stage levels:

  • 1053 Acre Feet  Approximate total Capacity
  • 600 Acre Feet    Stage 1 Mandatory Water Conservation
  • 300 Acre Feet    Stage 2 Mandatory Water Rationing - 25% use reduction compared to baseline year
  • 200 Acre Feet    Stage 3 50% use reduction compared to baseline year 
  • 50 Acre Feet      Stage 4 75% use reduction compared to baseline year

**1 acre foot = 325,851 gallons

News and Updates

  • SCE implements Stage I Mandatory Water Conservation, 7/05/2022.
  • SCE awarded funding for $10,000,000 for Water Desalination Grants, 12/6/19.
  • SCE recommended funding for $10,000,000 from Proposition 1 Water Desalination Grant Program Continuous Application Process (CAP3), 10/18/19.
  • SCE recommended funding for the second desalination plant from the Department of Water Resources for $3,610,575, 5/1/19. SCE awarded funding from the Proposition 1 Water Desalination Grant Program, 6/18/19.

Middle Ranch Reservoir Level

Date(Acre Feet)Feet Above Sea Level
January 24, 2023729.40657.50
January 17, 2023702.66656.83
January 9, 2023456.41649.95
January 4, 2023441.73649.48
December 19, 2022427.96649.03
December 12, 2022429.48649.08
December 3, 2022435.58649.28
November 28, 2022435.88649.29
November 14, 2022449.50649.73
 October 28, 2022458.94650.03
 October 17, 2022463.70650.18
 October 10, 2022466.58650.27
 October 3, 2022472.36650.45
 September 20, 2022492.26651.06
 September 5, 2022495.90651.17
 August 22, 2022503.23651.39
 August 15, 2022512.99651.68
 August 9, 2022521.14651.92
 July 22, 2022543.94652.58
 July 6, 2022559.79653.03 
 June 27, 2022567.61653.25
 June 20, 2022578.3653.54
 June 6, 2022588.90653.84
 May 12, 2022629.27654.93 
 April 6, 2022653.19655.56
 March 9, 2022663.95655.84
 February 9, 2022677.91656.20
 January 5, 2022687.69 656.45
 December 1, 2021680.25656.26
 November 3, 2021698.70656.73
 October 4, 2021718.17657.22
 September 3, 2021761.06658.28
 August 5, 2021777.92658.69
 July 7, 2021812.92659.53
 June 2, 2021850.21660.41
 May 3, 2021872.96660.94
 April 8, 2021901.58661.60
 March 3, 2021921.71662.06
 February 2, 2021923.03662.09 
 January 6, 2021923.47662.10
December 7, 2020931.83662.29
November 6, 2020938.01662.43
October 5, 2020961.07662.95
September 5, 2020980.27663.38
August 5, 20201001.84663.86
July 6, 20201021.72664.30
June 4, 20201040.80664.72
May 4, 2020 1053.58665.99
April 8, 20201053.58665.10
March 2, 20201053.58665.05
February 3, 20201053.58665.09 
January 1, 20201053.58665.10
December 9, 20191038.53664.67
December 2, 20191032.16 
October 7, 20191033.98664.57
September 16, 20191053.58 
August 5, 20191053.58665.10
May 1, 20191053.58665.13
March 26, 2019105358665.05
February 25, 20191053.58 665.18
February 14, 20191053.85 666.2 
February 11, 2019882.03661.15
February 7, 2019868.22660.83
January 22, 2019821.34659.73
January 15, 2019547.44652.68
January 7, 2019538.01652.41
January 2, 2019538.36652.42
December 26, 2018536.63652.37
December 10, 2018540.8652.49
December 3, 2018523.88652.0
November 26, 2018521.48651.93
November 19, 2018524.9652.03
November 12, 2018529.03652.15
November 9, 2018532.82652.26
October 29, 2018538.01652.41
October 22, 2018541.49652.51
October 15, 2018546.03652.64
September 28, 2018 552.36652.82 
September 17, 2018560.84653.06
September 12, 2018563.69 653.14
September 4, 2018 568.33 653.27
August 27, 2018576.94653.51
August 3, 2018601.35654.18
July 23, 2018610.96654.44
July 16, 2018616.16654.58
July 9, 2018622.88654.76
July 2, 2018630.40654.96
June 15, 2018648.98655.45
June 7, 2018655.49655.62
May 14, 2018668.21655.95
May 9, 2018671.69656.04
April 19, 2018688.86656.48
April 13, 2018694.37656.62
April 6, 2018696.73656.68
March 22, 2018702.66656.83
March 8, 2018708.61656.98
February 7, 2018718.57657.23 
January 22, 2017722657.33
December 23, 2017720657.08
December 11, 2017725 
November 28, 2017726657.4
November 13, 2017726657.42
November 9, 2017726 
October 2017  
September 19, 2017733657.6
August 24, 2017734 657.62
August 8, 2017736657.6
July 13, 2017729657.5 
July 7, 2017729 657.5
June 29, 2017725657.4
June 22, 2017724657.3
June 15, 2017716 657.1
June 8, 2017710657.0
June 1, 2017704656.7
May 25, 2017692656.4
May 18, 2017684656.2
May 11, 2017673655.9
May 4, 2017657655.5
April 27, 2017646655.2
April 20, 2017634654.9
April 13, 2017619654.5
April 6, 2017604654.1
March 30, 2017589653.7
March 23, 2017571653.2
March 16, 2017556652.8
March 9, 2017538652.3
March 7, 2017  
March 2, 2017524651.9
February 23, 2017507651.4
February 16, 2017292643.7
February 9, 2017287643.5
February 2, 2017283643.3
January 26, 2017283643.3
January 19, 2017137636.0
January 12, 2017133635.8
January 5, 2017131635.7
December 30, 2016129635.6
December 22, 2016127635.5
December 16, 2016123635.3
December 8, 2016123635.3
December 1, 2016123635.3
November 23, 2016123635.3
November 17, 2016121635.2
November 3, 2016123635.3
October 27, 2016125635.4
October 21, 2016125635.4
October 13, 2016127635.5
October 6, 2016127635.5
September 29, 2016131635.7
September 22, 2016133635.8
September 15, 2016135635.850
September 8, 2016137635.957 
September 1, 2016139636.1
August 25, 2016141636.2
August 18, 2016145636.4
August 11, 2016147636.5
August 4, 2016151 
July 28, 2016153636.8
July 21, 2016157657.0
July 14, 2016161673.2
July 7, 2016163637.3
June 28, 2016167637.5
June 23, 2016169637.6
June 16, 2016171637.7
June 10, 2016175637.9 
June 2, 2016177637.984
May 26, 2016179638.069 
May 19, 2016181638.190
May 12, 2016183 
May 5, 2016183 
April 28, 2016185 
April 21, 2016187 
April 14, 2016189 
April 7, 2016191 
March 31, 2016191 
March 25, 2016193 
March 17, 2016195639.913 
March 10, 2016195 
March 3, 2016195 
February 25, 2016195 
February 18, 2016197 
February 11, 2016197 
February 5, 2016199 
January 28, 2016199 
January 21, 2016199639.130 
January 7, 2016199639.132 
December 23, 2015199639.109 
December 17, 2015199639.114 
December 10, 2015201 
December 3, 2015201 
November 19, 2015205 
November 12, 2015207 
November 5, 2015209 
October 29, 2015211 
October 22, 2015211 
October 15, 2015215 
October 1, 2015217 
September 24, 2015219 
September 17, 2015223 
September 10, 2015223 
September 3, 2015225 
August 27, 2015227 
August 20, 2015229 
August 13, 2015231 
August 6, 2015 233  
July 30, 2015235 
July 23, 2015239 
July 16, 2015239 
July 9, 2015241 
July 1, 2015243 
June 25, 2015245 
June 18, 2015247 
June 11, 2015249 
June 4, 2015251 
May 28, 2015253 
May 21, 2015255 
May 14, 2015257 
May 7, 2015257 
April 30, 2015259 
April 24, 2015259 
April 16, 2015261 
April 9, 2015265 
April 2, 2015267 
March 26, 2015269 
March 19, 2015271 
March 12, 2015273 
March 5, 2015275 
Feb. 26, 2015275 
Feb. 19, 2015 275  
Feb. 12, 2015277 
Feb. 5, 2015277 
Jan. 29, 2015277 
Jan. 22, 2015277 
Jan. 15, 2015277 
Jan. 7, 2015275 
Dec. 30, 2014277 
Dec. 24, 2014279 
Dec. 18, 2014279 
Dec. 11, 2014275 
Dec. 4, 2014275 
Nov. 27, 2014n/a 
Nov. 20, 2014273 
Nov. 13, 2014275 
Nov. 6, 2014277 
Oct. 30, 2014277 
Oct. 23, 2014277 
Oct. 16, 2014277 
Oct. 9, 2014279 
Oct. 2, 2014283 
Sept. 25, 2014283 
Sept. 17, 2014285 
Sept. 11, 2014n/a 
Sept. 4, 2014292 
Aug. 29, 2014289 
Aug. 22, 2014289 
Aug. 14, 2014307 
Aug. 11, 2014  
Aug. 7, 2014311 
July 31, 2014316 
July 24, 2014318 
July 17, 2014323 
July 3, 2014330 
June 25, 2014337 
June 19, 2014342 
June 12, 2014344 
June 5, 2014350 
May 28, 2014355 
May 22, 2014358 
May 15, 2014363 
May 9, 2014366 
May 1, 2014371 
April 24, 2014377 
April 17, 2014379 
April 10, 2014385 
April 2, 2014388 
March 27, 2014391 
March 17, 2014394 
March 14, 2014394 
March 3, 2014394 
Feb. 27, 2014391 
Feb. 20, 2014391 
Feb. 14, 2014394 
Feb. 7, 2014394 
Jan. 30, 2014394 
Jan. 24, 2014394 
Jan. 16, 2014394 
Jan. 9, 2014396 
Jan. 2, 2014396 
Dec. 26, 2013399 
Dec. 18, 2013399 
Dec. 12, 2013399 
Dec. 5, 2013402 
Nov. 26, 2013399 
Nov. 20, 2013399 
Nov. 14, 2013402 
Nov. 7, 2013405 
Oct. 31, 2013405 
Oct. 24, 2013411 
Oct. 17, 2013414 
Oct. 10, 2013417 
Oct. 3, 2013420 
Sept. 26, 2013426 
Sept. 12, 2013435 
Sept. 5, 2013442 
Aug. 28, 2013448 
Aug. 22, 2013451 
Aug. 15, 2013460 
Aug. 8, 2013467 
Aug. 1, 2013483 
July 25, 2013483 
July 18, 2013494 
July 11, 2013503 
July 3, 2013514 
June 27, 2013520 
June 20, 2013527 
June 13, 2013535 
June 6, 2013542 
May 30, 2013553 
May 23, 2013563 
May 16, 2013574 
May 7, 2013582 
May 3, 2013582 
April 25, 2013589 
April 11, 2013604 
March 28, 2013615 
March 21, 2013623 
March 12, 2013630 
March 8, 2013634 
Feb. 28, 2013638 
Feb. 14, 2013646 
Jan. 18, 2013657