Steve Pomerance

Flooding in Boulder will get worse as climate change increases storm intensity and frequency. Thus, making good decisions about flood protection is critical; they should be based on facts, not speculation or defensiveness about past decisions. The assertion being made that the dam and floodwall currently proposed for South Boulder Creek will be “lifesaving” is a good sound bite. But it is not supported by the facts: No one died in South Boulder during the 2013 floods; the only deaths in or near the city were two people descending a flooded road in the North Boulder foothills. U.S. 36 is frequently closed by snowstorms and will flood anyway in storms larger than the dam is designed for. Boulder Community Hospital is accessible by many other routes. And the city can purchase a few high-water 4WD vehicles for emergency evacuations by first responders. The City’s 2014 flood survey shows that the proposed dam and floodwall will only address a fraction of the flooding damage in South Boulder...

A few weeks ago, the council authorized “by emergency” a $66 million dollar bond issue to cover (some of) the remaining costs of its attempts to protect downstream properties when South Boulder Creek floods again. SBC has had major floods in the past, including in 1893, 1934 and 1969. The City has a map of what buildings would and would not be “protected” by the proposed Phase 1 dam from a “100-year” flood. It shows that, in spite of the dam, a huge number of buildings will still be vulnerable to SBC flooding. Buildings/Removed Buildings in the S. Boulder Creek 100yr Floodplain proposed Project. (Photo credit / The City of Boulder) The Phase 2 and Phase 3 projects that are supposed to protect these buildings are not yet defined nor are there cost numbers, that I can find. Additionally, there is flooding from other sources, like Viele Channel and Anderson Ditch, that the dam won’t control at all. Also, I’ve been told that the City has none of the necessary regulatory body approvals for ...