Baltimore County had an average of 58,000 potholes per year in the last decade. That's over half a million potholes repaired in 10 years! And the more severe the winter is, with colder temperatures, and more snow and ice, the more severe the potholes are. During the particularly harsh winter of 1996, we had nearly 85,000 potholes on County roads. 
What Causes a Pothole? 1.
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 How Are Potholes Repaired? During colder months we use a product called cold mix that remains pliable in winter temperatures. When the materials become available in warmer months, we use a product called hot mix asphalt, which leads to a more permanent repair. 
A Baltimore County Highways crew patches potholes using cold mix
How to Report a Pothole You can report a pothole online, or call the Bureau of Highways at 410-887-3560. When we receive a request for repairs, it is forwarded to one of eleven Highways shops located throughout the County. Normally our crews will be able to make repairs to the pothole within 48 business hours. Revised July 9, 2009 | 
Courthouse 