March 1913 - The most disastrous flood in Ohio history claims nearly 500 lives after dumping more than 8 inches of rain in four days. In the Muskingum Watershed area, 11 died and property damage was estimated at nearly $9 million.
	February 1914 - Ohio Conservancy Act becomes effective after approval by the General Assembly, providing the legal framework for the creation of conservancy districts in Ohio.
	January 1927 - Zanesville Chamber of Commerce announces plan to establish a conservancy district in the Muskingum River watershed region. Bryce C. Browning is appointed manager of the Chamber of Commerce later that year.
	June 1933 - Conservancy Court approves the formation of the Muskingum Watershed Conservancy District and appoints a Board of Directors. A few days later Browning is appointed secretary by the Board.
	August 1933 - Official Plan for Flood Prevention and Water Conservation in the watershed is approved by MWCD Board of Directors.
	December 1933 - The federal government approves a grant of over $22 million to the U.S. Army Corps of Engineers for projects in the MWCD, along with a loan of $500,000 to the MWCD.
	April 1934 - Ohio General Assembly approves relocation of highways as needed in the Muskingum Watershed Conservancy District region and provides $2 million to assist the MWCD.
	January 1935 - Construction begins on Tappan Dam, the first project. By the end of 1938, the construction of 13 earthen dams and one concrete dam (Dover Dam) was completed.
	August 1939 - Federal Flood Control Act of 1939 is approved, transferring operation of the dams in the MWCD system to the U.S. Army Corps of Engineers.
	July 1940 - MWCD Board of Directors approves lease of its 10 lakes to the state of Ohio for public fishing, hunting and trapping.
	December 1942 - Board of Directors approves a policy for improving the forestry and timber services programs of the district, setting in motion a program that eventually leads to the planting of millions of trees as a renewable resource.
	April 1950 - Ten of the reservoirs are brought to their conservation pool levels, creating lakes for public use.
	January 1961 - Lowering of lake levels during winter months established as a policy by the MWCD and U.S. Army Corps of Engineers.
	December 1965 - Bryce Browning retires as secretary-treasurer and is succeeded by Raymond E. Eichel. Eichel previously had served in the accounting department.
	July 1969 - Thunderstorms over a two-day period (July 4 and 5) result in 4 to 10 inches of rain over the region causing damage totaling $4.6 million and 21 deaths. Corps of Engineers estimates $45 million in damage and a large number of lives were saved as a result of the MWCD flood-protection system.
	September 1989 - Raymond Eichel retires as secretary-treasurer after nearly 24 years of service and the Board of Directors appoints John M. Hoopingarner in his place. Hoopingarner had served as legal counsel to the district for 10 years.
	June 1994 - Conservancy Court appoints two additional members to the Board of Directors, expanding the number of board members to five after the passage of Ohio House Bill 450.
	June 2003 - Conservancy Court approves a petition filed by the Board of Directors requesting a readjustment of the appraisal of benefits accruing from the flood-reduction system. This would provide an equitable basis for the levy of a maintenance assessment in accordance with Ohio law.
	December 2004 - MWCD receives a $3.8 million planning loan from the Ohio Water Development Authority to prepare a plan for the collection and use of funds for the maintenance and enhancement of water resources in the district.
	January 2005 - Storms drop up to 6.5 inches of rain in the region, quickly swelling reservoirs and setting new levels of retention behind the dams at six locations. Corps of Engineers estimates total potential savings averted by the dams and reservoirs is around $400 million, bringing the total amount prevented since the system's inception to more than $6 billion.