- Colorado Springs Utilities
1865: The most senior water rights for the Rosemont system are obtained. Additional water rights are secured between 1871 and 1950.
1917: Water storage rights for Rosemont Reservoir are allotted. More storage rights are obtained from 1919 to 1960.
1918: Development of the Rosemont system begins with construction of Penrose Reservoir, which has a storage capacity of 45.3 acre feet. (An acre foot is 326,000 gallons.)
1928: Construction of Fisher Canyon Reservoir begins, which has a storage capacity of 53.6 acre feet.
1930: Construction of three diversions of water begin on Gould Creek, as well as construction of Rosemont Reservoir and Rosemont pipeline, by the Broadmoor Water and Power Company to serve the Broadmoor Hotel and facilities. Work is completed in 1932.
1951: Platt Rogers Tunnel is constructed; Gould Creek diversions are consolidated and enlarged at C.L. Tutt Diversion.
1962: Rosemont Reservoir is expanded to hold 2,541 acre feet of water, or a total of 828.4 million gallons. Rosemont Dam is a steel-faced, rockfill structure that's 90 feet tall and 680 feet across. (In contrast, Rampart Reservoir on Pikes Peak holds more than 15 times that amount.) While Rosemont water could be piped to a treatment plant and used for domestic purposes, it's not; the water is non-potable and suitable only for irrigation.
1973: The city acquires the Rosemont system from The Broadmoor for $874,000.
1980: The Broadmoor and other southern subdivisions are annexed into the city.
December 2012: Broadmoor officials inquire about the prospect of purchasing and assuming the operations and maintenance of the Rosemont system.
July 22, 2014: Colorado Springs Utilities agrees to evaluate the feasibility of the city selling the Rosemont system to The Broadmoor.
June to December 2015: Nash-Johnson Associates, Inc., of Englewood, reports the Rosemont system's land value ranges from $2.5 million to $4.5 million, depending on whether a protective covenant is put in place that would bar development of Rosemont Reservoir's shoreline.
Aug. 28, 2015: Helton & Williamsen, water resources consultant of Englewood, reports the water rights associated with the Rosemont system are worth almost $18.6 million (2,639.9 acre feet at $7,038 per acre foot.)
Jan. 19, 2016: The engineering and construction-management firm AECOM reports the value of the Rosemont system at nearly $30 million.
April 19, 2016: Deadline for Colorado Springs Utilities to convey its decision about selling the system to The Broadmoor. Utilities requests a new deadline of Aug. 31.
May 24, 2016: City Council approves trading Strawberry Fields open space to The Broadmoor in exchange for nearly 500 acres of trail easements and wilderness property.
Aug. 30, 2016: Utilities writes to The Broadmoor saying it will recommend the sale to the Utilities Board, subject to both parties agreeing to terms and "successful completion of a public process regarding the proposed transaction."
Source: Colorado Springs Utilities records