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We examined the efficacy of a mitigation project in Avra Valley Arizona, established to provide wildlife access across the barrier created by a canal, the Central Arizona Project (CAP). We monitored movements of 17 radio-collared desert mule deer (Odocoileus hemionus eremicus) to determine if deer were using the corridor for access across the canal and the 26-km wide valley We also determined frequency of corridor use by desert mule deer relative to surrounding lands. Four deer crossed the canal but stayed within 500 m of the crossing site. One deer traversed the valley via the corridor. Two of these deer used crossing areas not in the designated corridor. Overall, 22.4% of deer locations were in the corridor. The corridor currently serves as a link with other undeveloped lands to provide movement for animals seeking to cross Avra Valley, but some lands outside the corridor are scheduled for development for agriculture. With increasing pressures from an urban population, the corridor may prove to be of greater value in the future.