In Michigan's way-up-north Keweenaw Peninsula, where 200 inches of snow in a single season elicits barely a shrug, officials know there's nothing in the budget more important than keeping the roads passable.
Yet even they have been caught short this merciless winter. Houghton County planned to spend around $2.1 million for plowing, salting and related maintenance, which experience suggested would be plenty, but has overshot it by $500,000 and counting.
State and local governments across a huge swath of the nation, from the Great Plains to the Upper Midwest and the Deep South to New England, are experiencing sticker shock after one of the coldest, snowiest, iciest winters in memory. Many have spent two or three times as much as they budgeted for clearing roads. More bad weather could send costs higher.
(Read more: 'Weather' true or not, winter excuse wearing thin)
Even as Thursday's official arrival of spring presages warmer weather, it's clear that winter's bitter aftertaste will linger much longer as officials compensate for untold millions in unexpected spending that includes patching a rash of potholes. In some states, legislatures are already preparing emergency appropriations. Elsewhere, road agencies are delaying repaving projects, cutting back on roadside mowing and summer hires, dipping into rainy-day funds and making do with battered equipment instead of buying more.