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We present a wide-field photometric survey covering ~200 deg^2 toward theUpper Scorpius OB association. Data taken in the R and I bands with the Quest-2camera on the Palomar 48-inch telescope were combined with the 2MASS JHK surveyand used to select candidate pre-main sequence stars. Follow-up spectroscopywith the Palomar 200-inch telescope of 62 candidate late-type membersidentified 43 stars that have surface gravity signatures consistent withassociation membership. From the optical/near-infrared photometry and derivedspectral types we construct an HR diagram for the new members and find 30likely new brown dwarfs, nearly doubling the known substellar population of theUpper Scorpius OB association. Continuation of our spectroscopic campaignshould reveal hundreds on new stellar and substellar members.Comment: 36 pages including 14 figures and 2 tables. Accepted for publication  in A

A Large-Area Search for Low-Mass Objects in Upper Scorpius. I. The Photometric Campaign and New Brown Dwarfs