Source: http://netstate.com/states/symb/flags/co_flag.htm
Timestamp: 2019-04-19 08:28:55+00:00

Document:
The Colorado State Flag was designed by Andrew Carlisle Johnson and adopted by the Colorado General Assembly on June 5, 1911. The flag specifications seemed clear enough when adopted but modification to the legislation was required in 1929 and in 1964.
The field is comprised of three alternate stripes, the two outer stripes colored blue and the middle stripe white. At one fifth the length of the flag from the staff end is the letter "C". The color of the "C" is red. The diameter of the letter "C" is two thirds the width of the flag, the inner line of the letter being three fourths the width of its body and the outer line double the length of the inner line of the letter. The center of the letter "C" is filled with the color gold. It was also stipulated that the flag should have an attached cord of gold and silver intertwined with gold and silver tassels.
It seems that certain specifications for the flag were not clear and some controversy arose over the precise shades of red and blue to be used in the flag. This issue was resolved by the General Assembly on February 28, 1929 when it stipulated that the red and blue colors in the flag were to be the same as the national flag.
Again controversy developed over the specifications for the flag. This time at issue was the size of the letter "C". The General Assembly addressed this on March 31, 1964, revising the 1911 legislation to stipulate the diameter of the letter "C" and its distance from the staff.
The colors used in the Colorado State Flag represent environmental features of the state. The gold represents the abundant sunshine enjoyed by the state. The blue symbolizes the clear blue skies of Colorado. White represents the snow capped mountains of the state and red represents the color of much of the state's soil.
The following information was excerpted from the Colorado Revised Statutes , Title 24, Article 80, Part 9.
A state flag is hereby adopted to be used on all occasions when the state is officially and publicly represented, with the privilege of use by all citizens upon such occasions as they may deem fitting and appropriate. The flag shall consist of three alternate stripes to be of equal width and at right angles to the staff, the two outer stripes to be blue of the same color as in the blue field of the national flag and the middle stripe to be white, the proportion of the flag being a width of two-thirds of its length. At a distance from the staff end of the flag of one-fifth of the total length of the flag there shall be a circular red C, of the same color as the red in the national flag of the United States. The diameter of the letter shall be two-thirds of the width of the flag. The inner line of the opening of the letter C shall be three-fourths of the width of its body or bar, and the outer line of the opening shall be double the length of the inner line thereof. Completely filling the open space inside the letter C shall be a golden disk; attached to the flag shall be a cord of gold and silver intertwined, with tassels one of gold and one of silver. All penalties provided by the laws of this state for the misuse of the national flag shall be applicable to the said state flag.
Source: L. 11: p. 611, § 1. C.L. § 489. L. 29: p. 621, § 1. CSA: C. 152, § 4. CRS 53: § 131-8-4. C.R.S. 1963: § 131-8-4. L. 64: p. 660, § 2.
Source: Colorado General Assembly, Colorado Revised Statutes, , June 30, 2007.
Source: Colorado Department of Personnel & Administration, State Flag, , June 30, 2007.
Colorado State Flag: Colorado Department of Personnel and Administration: Division of Information Technologies.
Colorado (U.S.): FOTW "Flags of the World" Web Site.

References: § 1
 § 489
 § 1
 § 4
 § 131
 § 131
 § 2