The Geographic Names Information System of the United States Geological Survey places the headwaters of the main/west branch of Euclid Creek between Fairmount Blvd.
and Fairwood Court in Beachwood, Ohio (41°29′13.0″N 81°29′25.1″W).
The Division of Surface Water of the Ohio Environmental Protection Agency places the headwaters roughly 0.5 miles (0.80 km) to the north, on the Acacia Reservation of the Cleveland Metroparks in Lyndhurst, Ohio (41°30′18.7″N 81°29′37.3″W).
Both are at an elevation of 1,200 feet (370 m) above mean sea level.
This is an area of hummocks and knolls with soil that ranges from poorly drained to moderately well drained.
Soil permeability is slow to moderately slow.

The main branch of Euclid Creek gently meanders over a nearly level plateau through the cities of Lyndhurst, Mayfield Heights, Richmond Heights, South Euclid, and Euclid.
Soil permeability improves in Richmond Heights, South Euclid, and Euclid, ranging from moderately slow to moderately rapid.
After passing down the Portage Escarpment, the stream flows across the loamy, fine-sand, lacustrine sediment of the Erie Plain.
Here the soil is moderately well drained and rapidly permeable.
Much of the main branch's streambed was determined by the Wisconsin glaciation.

The main branch passes through some of the most densely urbanized land in Cuyahoga County.
There is little remaining floodplain or intact stream banks.
Poor soil permeability for much of the stream's length and the extensive impervious surfaces of the urban landscape contribute to flash flood-like stream flows.
These flows inhibit the quantity and diversity of fish and aquatic insect populations.

Where it drops over the Portage Escarpment, the main branch has carved a 2.75-mile (4.43 km) long gorge.
At the head (south end) of the gorge, at what is now the intersection of E. Green Road and Anderson Road, the stream tumbles over a waterfall.
The gorge is 100 feet (30 m) to 180 feet (55 m) deep and an average of 600 feet (180 m) wide.
Euclid Creek meanders across the flat bottom of the gorge, where it has carved a channel 10 feet (3.0 m) deep into the alluvial soil and the shale rock.
Although the depth of Euclid Creek in the gorge is usually no more than ankle- to knee-deep, the stream has eroded a few deep potholes in the shale streambed, some up to 8 feet (2.4 m) deep.

Emerging from this gorge about where Euclid Avenue and Chardon Road meet today, the creek meanders across the Erie Plain, a relatively flat area with low, rolling hills.
It has carved a channel 200 feet (61 m) wide and 40 feet (12 m) deep in the Erie Plain.

The mouth of Euclid Creek is located on Lake Erie at 41°35′10.2366″N 81°33′54.8166″W, 570 feet (170 m) above mean sea level.
The Geographic Names Information System of the United States Geological Survey places the headwaters of the main/west branch of Euclid Creek between Fairmount Blvd. and Fairwood Court in Beachwood, Ohio (41°29′13.0″N 81°29′25.1″W). The Division of Surface Water of the Ohio Environmental Protection Agency places the headwaters roughly 0.5 miles (0.80 km) to the north, on the Acacia Reservation of the Cleveland Metroparks in Lyndhurst, Ohio (41°30′18.7″N 81°29′37.3″W). Both are at an elevation of 1,200 feet (370 m) above mean sea level. This is an area of hummocks and knolls with soil that ranges from poorly drained to moderately well drained. Soil permeability is slow to moderately slow.
The main branch of Euclid Creek gently meanders over a nearly level plateau through the cities of Lyndhurst, Mayfield Heights, Richmond Heights, South Euclid, and Euclid. Soil permeability improves in Richmond Heights, South Euclid, and Euclid, ranging from moderately slow to moderately rapid. After passing down the Portage Escarpment, the stream flows across the loamy, fine-sand, lacustrine sediment of the Erie Plain. Here the soil is moderately well drained and rapidly permeable. Much of the main branch's streambed was determined by the Wisconsin glaciation.
The main branch passes through some of the most densely urbanized land in Cuyahoga County. There is little remaining floodplain or intact stream banks. Poor soil permeability for much of the stream's length and the extensive impervious surfaces of the urban landscape contribute to flash flood-like stream flows. These flows inhibit the quantity and diversity of fish and aquatic insect populations.
Where it drops over the Portage Escarpment, the main branch has carved a 2.75-mile (4.43 km) long gorge. At the head (south end) of the gorge, at what is now the intersection of E. Green Road and Anderson Road, the stream tumbles over a waterfall. The gorge is 100 feet (30 m) to 180 feet (55 m) deep and an average of 600 feet (180 m) wide. Euclid Creek meanders across the flat bottom of the gorge, where it has carved a channel 10 feet (3.0 m) deep into the alluvial soil and the shale rock. Although the depth of Euclid Creek in the gorge is usually no more than ankle- to knee-deep, the stream has eroded a few deep potholes in the shale streambed, some up to 8 feet (2.4 m) deep.
Emerging from this gorge about where Euclid Avenue and Chardon Road meet today, the creek meanders across the Erie Plain, a relatively flat area with low, rolling hills. It has carved a channel 200 feet (61 m) wide and 40 feet (12 m) deep in the Erie Plain.
The mouth of Euclid Creek is located on Lake Erie at 41°35′10.2366″N 81°33′54.8166″W, 570 feet (170 m) above mean sea level.
Euclid Creek