Olentangy River Watershed

The Olentangy River flows 88.5 miles from its headwaters in Crawford and Richland County through Marion and Morrow County into the City of Delaware and ending in Franklin County at its confluence with the Scioto River.

The Olentangy River has a drainage area of 536 square miles. Twenty-two miles of the Olentangy were designated a state Scenic River by the Ohio Department of Natural Resources in 1973.

The designation runs from the Delaware Dam, north of the City, to the old Wilson Bridge Road in Worthington.


Everyone lives in a watershed and the City of Delaware is located in the Olentangy River watershed. A watershed is an area of land that directs surface water and ground water towards a single body of water. A ridge separates one watershed from another and will drain the water in different directions.

Each watershed can be broken down into subwatersheds or increased into larger watersheds. If the Olentangy River watershed was broken into smaller subwatersheds, some residents in the City of Delaware would live in the Delaware Run subwatershed, while others would live in the Sugar Run subwatershed. There are several other small waterways connecting to the Olentangy River that would be additional subwatersheds.

If the Olentangy River watershed was increased into larger watersheds, the Delaware City residents could say they live in the Scioto River watershed. Since the Olentangy drains into the Scioto River this would be a true statement. This also makes our watershed the Ohio River, Mississippi River, and Gulf of Mexico.  


June 5th
- Rain Barrel Workshop
@ First Friday Festivities downtown Delaware
6:00-9:00 pm

June 20th - NOW (Northern Olentangy Watershed) Festival
@ Mingo Park (500 E. Lincoln Ave, Delaware, OH 43015)
12:00 (noon)-3:00 pm

July 11th - Whetstone River Clean-up
@ specific location TBD (contact Kristin Piper closer to date)
9:00-11:00 am

July 11th - Delaware Dam tour/rain garden and rain barrel workshops
@ Delaware Dam (3920 US Highway 23 North, Delaware, OH)
1:00 pm-?

August 15th - Olentangy River Clean-up
@ specific location TBD (contact Kristin Piper closer to date)
9:00-11:00 am


The 2nd annual Northern Olentangy Watershed (NOW) Festival is scheduled for Saturday, June 20th from noon until 3:00pm. The event will be held at Mingo Park by the shelter houses - if weather is nice or inside the gymnasium - if poor weather occurs that day. Booth attendees and sponsors include, Olentangy Watershed Alliance, ODNR – Division of Watercraft and Wildlife, Preservation Parks of Delaware County, ECO Center – in Morrow County, Del-Co Water Company, the Army Corps of Engineers, FLOW, Sierra Club, and several others. A rain garden maintenance workshop, rain barrel workshop, enviroscape model, plant filtration activity, canoe float, macroinvertebrate sampling (SQM), painted rain barrel raffle, and several other activities/events are scheduled throughout the day.

The event is FREE to attend and all are welcome to join in the fun! We hope to see you there!


Spring 2013
Fall 2013
Winter 2013
Spring 2014
Summer 2014
Fall 2014
Winter 2014
Spring 2015
Summer 2015

HOW CAN YOU PROTECT THE Olentangy River Watershed:

City Watershed Coordinator Kristin Piper can be reached at 740-203-1905.

Drains to River Brochure
Storm Water Quality Implementations Brochure
Pet Waste Removal Flyer


Olentangy Watershed Alliance                       Crawford County Health Department
Crawford County SWCD                                 Delaware County Health Department
Delaware County SWCD                                 Marion County Health Department
Marion County SWCD                                    Morrow County Health Department
Morrow County SWCD                                   Richland County Health Department
Richland County SWCD
Ohio EPA
ODNR - Division of Soil and Water