What would be useful is if someone did a cost benefit analysis:
* Average number of snowfalls in Wash DC (well actually Arlington) per year (dont base policies on extremes like snowmageden).
* Average number of bicycle commuters that time of year
* Cost of clearing the trails
* Benefit of clearing the trails (meaning how much time would the trails be impeded absent clearing; and with a clearing, how, well, available trails are).
* Environmental cost of clearing the trails (if for instance deicer is used)
Back of the envelop math
Current results per winter
Average number of days of snow 8.1
Average total accumulation 14.5 or less than 2″ per event
“These averages don’t show how much the snowfall in Washington varies from year to year. In December, for instance, one in four years totals over 2.5 inches of snow. Another 25 percent of years receive no snow for the month.”
“About half the days with snowfall in Washington leave just a skiff, amounting to less than an inch, of fresh snow on the ground. “
NOAA has the average January snow fall at 6.2 inches
According to Bike Arl data, at the Custis Rosslyn counter, in Jan. 2013, on an average thursday there was 905 bikes counted. I will presume a significant portion of those were two way trips (to and from). Trail traffic counts varies greatly from peak to winter. Add to this that not all of these are Arl residents and Arl taxpayers who would pay for the plowing.

How long does snow last on the ground in Washington? We the average snow fall is not deep. My personal experience (lived here 50 years) is that most snowfalls are gone almost in the first day they are here. Weather.com has the average high temperature in January as 43. That, and solar, is sufficient to melt a dusting of snow.
Of course the problem is that the average low temperature is 29. In other words, what melts in the day freezes at night. Why are Wash DC drivers so bad. Well there are lots of reasons, but a big one is that our winter storms involve a lot of ice. Plowing is ineffective in this situation.
Oh, here is another variable. Where snow events in Wash DC are significant, the Fed. Govt goes on Liberal Leave status and schools close. This will reduce on that day the number of cyclists desiring to bike to work (by how much, I dont know).
How much does snow removal cost? I have seen costs all over the place. But VDOT budgeted last year $55m for snow removal for NOVA. Snow removal can be expensive. And it if we want it on the trails, it might require special equipment. And it might require rebuilding the trails to make them compatible with snow removal.
Plowing has been known to damage the surface the road. Rebuilding trails after plowing would be an added costs (roads frequently have to be repaved in the springs of major storms). And the use of deicer / brine has been criticized by the ecological movement. Wikipedia. Since our trails go by ecologically sensitive environments and are in parks, this is of particular concern (roads have storm drains – while the brine may be problematic there too – it goes into drains, not ponds and streams).
Finally, consider that many jurisdictions would have to be brought on board for this to work. Custis is Arlco. WOD is NVPRA. MVT is NPS. (And given the environmental impact, I doubt NPS will ever get on board).
Finally, do cyclists have alternative routes? During a small event…. probably on road. During a major event… I dont think I would want to be on a road even if plowed. But a significant portion of cyclists can take public transportation.
Okay, so what does this add up to?
* Probability of an event is small
* The events themselves are generally small
* The length of the impact is generally small
* The benefit of plowing in terms of time that it would open the trail (over not plowing at all) is likely small
* The problem of ice will not be solved so much by plowing
* Ice could be solved by deicer, but there is an environmental impact
* The cost may be significant
* The number of cyclists who benefit may be limited. (a few hundred)
So…. um…. this isnt actually meant to be an argument. This is meant to be a cost benefit analysis. This is suppose to be just the facts. In other words, if this is wrong, what facts support it being wrong.
The only opinion I have is I hate policy based on extreme conditions. Snowmageden was extreme. Snowmageden resulted in Arlco passing what I consider to be a highly questionable snow clearing ordinance (one that Arlco itself does not comply with – they do not clear all of county or APS sidewalks – or we would not be having this discussion). To me, the only Snowmageden argument that can be made is that Snowmageden is indicative of climate change, and that winters around here are going to be worse than the data from the past suggests. In other words, looking at previous performance is no indicator of future grown.