  For about two decades, a population of relative small and nearby molecular
clouds has been known to exist at high Galactic latitudes. Lying more than
10$^\circ$ from the Galactic plane, these clouds have typical distances of
$\sim$150 pc, angular sizes of $\sim1^\circ$, and masses of order tens of solar
masses. These objects are passive sources of high-energy $\gamma$-rays through
cosmic ray-gas interactions. Using a new wide-angle CO survey of the northern
sky, we show that typical high-latitude clouds are not bright enough in
$\gamma$-rays to have been detected by EGRET, but that of order 100 of them
will be detectable by the Large Area Telescope (LAT) on GLAST. Thus, we predict
a new steady population of $\gamma$-ray sources at high Galactic latitudes,
perhaps the most numerous after active galactic nuclei.
