What is missing on the historic map?

What is missing on the historic map?

These two maps show the same area, but at different points in time.

Compare the number of lakes and ponds between the two maps.

1888, Water District 6 Map

There may have been two very small marshy "lakes" in 1888, when this map was made:

2009, City of Boulder Open Space Map

This map has color coded our new lakes by quarter-century, based on their construction dates and when they first showed up in aerial surveys.

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