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


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. Several activities, workshops, and demonstrations will be available for anyone willing to attend. The event is free to attend and all are welcome to join in the fun!

The 2nd annual NOW Conservation Award call for nominations is now open. The City of Delaware and the NOW Festival Planning Committee recognize those in the watershed community that exemplify the true spirit of environmental stewardship and preservation in the watershed. An award will be presented during the NOW Festival to a recipient in each of three categories: individual/family, local business, and local governmental entity living or operating within the Upper Olentangy River Watershed. This includes portions of Delaware, Marion, Morrow, and Crawford Counties. The selection of award winners is based on the nominee's leadership, inspiration of work to others, utilization of innovative strategies and techniques to achieve meaningful results and their ability to foster sustainable growth within the watershed community. If you know of someone who meets this criteria, please nominate them or encourage them to nominate themselves. Nomination forms are due by April 30th to Kristin Piper.
Click here for the nomination form.

A rain barrel painting raffle will take place at the 2015 NOW Festival. Last year, a total of 13 barrels were sponsored by local individuals and companies. The barrels were painted and raffled off at the festival. Those that wish to sponsor a rain barrel for the 2015 NOW Festival can do so, until April 15th. To see some examples of the barrels at last year's NOW Festival and/or sponsor a barrel for this year's event, please
click here.


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