Chagrin River from South Chagrin Reservation
|Source||Bass Lake, Ohio|
|- location||Munson Township, Northeast Ohio|
|Eastlake, Lake County, OH|
CHAGRIN RIVER Latitude and Longitude:
|- location||Eastlake, OH|
The Chagrin River is located in Northeast Ohio.  The river has two branches, the Aurora Branch and East Branch. Of three hypotheses as to the origin of the name, the most probable is that it is a corruption of the name of a Frenchman, Sieur de Seguin, who established a trading post on the river ca. 1742.    The Chagrin River runs through suburban areas of Greater Cleveland in Cuyahoga, Geauga, and Portage counties, transects two Cleveland Metroparks reservations, and then meanders into nearby Lake County before emptying into Lake Erie.
The East Branch  begins in Geauga County, flows north then west through Lake County, largely in Kirtland, and Kirtland Hills, In these communities the East Branch transects the Holden Arboretum, before intersecting the main in Willoughby.
The Chagrin River was designated as a state scenic river in 1979.
Along its banks and tributaries Berea sandstone, Bedford shale, Cleveland Shale, and Chagrin Shale bedrock, are exposed in layers. The river itself was cut through the Allegheny Plateau as glaciers receded in the area at the end of the Wisconsin glaciation.
The lowest visible bedrock is Chagrin shale. Named for the river and easily found in the river valley. Chagrin shale, is blue gray in color, an offshore alluvial, silt shale of the Devonian period. This layer is found below about 800 feet (240 m) msl.
The next layer is Cleveland shale. This is a black shale that is an important source of local fossils. Cleveland Shale is found in the Chagrin River valley between 800 and 900 feet (270 m) msl.
Bedford Shale is found above the Cleveland Shale layer. This material marks the uncertain transition between the Devonian and Pennsylvanian periods in the region and is also an important source of local fossils. This layer is found in the ravines that carry tributaries of the Chagrin River . Bedford shale is a sand shale and is characterized by its roughly 90° cleavage pattern. Pieces of Bedford shale can look as if they were cut by human hands and are found up to about 950 feet (290 m) msl.
Berea sandstone is found from around 950 feet (290 m) msl to roughly 1,070 feet (330 m) msl. Berea sandstone, is an important local building material. In the nineteenth century it was quarried from the base of Gildersleeve Mountain (in the East Branch watershed). This material was used to build Kirtland Temple and other local structures. Berea sandstone is still used as a local building material
According to the Ohio Department of Natural Resources, more than 49 species of fish and 90 bird species live in the Chagrin River watershed, including the American brook lamprey, which is relatively rare in Ohio.
Hiking is popular along many areas along the Chagrin River.  Some area are also popular for fishing, and ESPN Outdoors recommends the Chagrin River for fishing,  especially for finding steelhead. The Daniels Park Dam, a small lowhead dam, was their favorite spot. On December 31, 2004, the Daniels Park Dam failed due to excess pressure from ice and water. 
In 2007, in violation of both state law and Federal Regulations, the 8,700 feet (2,700 m) of the East Branch of the river was channelized and diked to prevent flooding on agricultural land owned by the Village of Kirtland Hills. This activity was conducted by local developer Jerome Osborne who leases the land from the village. Both the village and Osborne have been cited for this illegal activity.  This activity both threatened the riparian floodplain in the area of disruption, and increases the likelihood and severity of flooding in downstream the communities of Willoughby and Eastlake. As of September 2007, a plan was being developed to restore the East Branch to its original condition, and further action against the cited parties is being considered. 
Viewed from Hach-Otis Sanctuary ( Willoughby Hills, Ohio).
Viewed in fall, from Willoughby Hills, Ohio.
- U.S. Geological Survey Geographic Names Information System: Chagrin River
- Chagrin State Scenic River, Ohio Department of Natural Resources. Accessed 2007-09-08.
- "Chagrin River." The Encyclopedia of Cleveland History. July 10, 1997. Accessed February 9, 2007.
- "Chagrin Falls, an Ohio Village History", ISBN 0-9753051-0-7, pub. 2005 by The Chagrin Falls Historical Society
- U.S. Geological Survey Geographic Names Information System: East Branch Chagrin River
- U.S. Geological Survey Geographic Names Information System: Aurora Branch
- https://www.alltrails.com Chagrin River Park Trail.
- Landahl, Dave. Chagrin River's dams are best for metalheads, Fishing and Hunting News, 2003
- Frischkorn, Jeffrey L. (2005-01-03). "Dam Breaks". The News-Herald. Retrieved 2009-02-03.
- "Chagrin, Aurora Branch, Ohio, US Chagrin Reservation". 2005-05-17. Retrieved 2014-08-10.
- O'Donnell, Patrick (2007-09-01). "Osborne cited for dredging river". The Plain Dealer. Retrieved 2009-02-03.
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