Today, 130 years ago, Colorado was admitted to the US as a state.
That’s our current flag, adopted in 1911, which has the following specifications:
The flag consists of three alternate stripes 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 is a circular red C, of the same color as the red in the national flag of the United States. The diameter of the letter is two-thirds of the width of the flag. The inner line of the opening of the letter C is three-fourths of the width of its body or bar, and the outer line of the opening is double the length of the inner line thereof.
Completely filling the open space inside the letter C is a golden disk, attached to the flag is a cord of gold and silver, intertwined, with tassels, one of gold and one of silver.
I’ve always thought it would look better if the corners at the opening to the “C” hit the borders between the stripes, but nobody asked me.
The original state flag, and a bit more history about this one, can be found here.