In operation for more than 50 years, Winzler & Kelly is one of the leading engineering firms in the United States. The firm offers a range of surveying and planning services for clients throughout Southern California, as well as to several state and federal agencies around the Pacific Rim. It operates Norris-Repke, which is a civil engineering and construction administration. Winzler & Kelly has expertise in permitting, modeling, asset management and repair services. The firm provides flood control, site development, bridge design, and water distribution and storage solutions. It offers geologic evaluation solutions for timber harvest plans. In addition, Winzler & Kelly has aerial photograph interpretation capabilities.