  The Sloan Digital Sky Survey (SDSS) is a project to definitively map $\pi$
steradians of the local Universe. An array of CCD detectors used in drift-scan
mode will digitally image the sky in five passbands to a limiting magnitude of
$r' \sim 23$. Selected from the imaging survey, $10^6$ galaxies and $10^5$
quasars will be observed spectroscopically. I describe the current status of
the survey, which is due to begin observations early in 1997, and its prospects
for constraining models for dark matter in the Universe.
