Twin Lakes Upper Dam and Greenlawn Low Head Dam Improvements - City of Columbus

The scope of this project includes, but is not limited to, the following: site work and renovation of a water / sewer project. As of February 16, 2023, a design engineer has been selected. Information regarding contractor selection has not been disclosed. A firm timeline has not been established; however, funding is programmed in the city's Capital Improvement Plan (CIP) for 2019 and 2020. *The following has been preserved for historical reference: The City of Columbus seeks engineering services to investigate, evaluate, and develop improvements at two Level II dams within the City. These two locations are the Twin Lakes Upper Dam and the Greenlawn Avenue Low Head Dam. These project locations are identified in Appendix D. The Ohio Department of Natural Resources (ODNR) performs periodic inspections to evaluate the condition of dams and their appurtenances. Copies of the 2012 and 2016 ODNR reports for both the Twin Lakes Upper Dam and the Greenlawn Avenue Low Head Dam can be found in Appendix D. The City of Columbus Division of Sewerage and Drainage (DOSD) initiated CIP 611038-100000 to provide the detailed design, specifications, contract documents, and other reports required for the improvements at Twin Lakes Upper Dam and the Greenlawn Avenue Low Head Dam. The scope of work for this project is to perform all the requisite investigation, evaluation, formulation and design work to prepare design recommendations and construction documents for the improvement.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Dam Construction and Equipment.