The stream's watershed has seven distinctive subwatersheds.
These are:
Subwatershed 1: Erie Plains in the Nottingham neighborhood—This 23-square-mile (60 km²) area contains 3 miles (4.8 km) of the main branch stream, between Lake Erie/Lower Euclid Creek Reservation and the Euclid Creek Reservation.
About 6 percent of this area is undeveloped, and more than 25 percent is covered with impervious surfaces such as parking lots or buildings.
The Lake Erie coastline and Euclid Creek lacustuary have been highly modified to accommodate bathing beaches, marinas, onshore developments, parks, piers, and other developments and uses.
Marshlands and an oxbow have been removed, although partial floodplain and stream restoration have occurred.
Between the park and Interstate 90, Euclid Creek is highly channelized, although a riparian zone exists on either side that shields the stream from the dense urban development adjacent to it.
At Villaview Road, the stream enters a long tunnel that takes it beneath Interstate 90.
It briefly emerges at E. 185th Street, where the St. Clair Spillway helps keep stream velocity low.
The creek then enters a short tunnel to pass beneath the CSX railroad tracks.
Between the railroad tracks and the Euclid Creek Reservation, much of Euclid Creek runs in a concrete channel completed as part of a flood control project.
Shoaling (the accumulation of debris and sediment) has worsened in this area, reducing the effectiveness of the flood control measure.
Extensive illegal dumping occurs in the creek between Lakeshore Blvd.
and the Euclid Creek Reservation.

Subwatershed 2: Euclid Creek Reservation—This 10-square-mile (26 km²) area contains 6.8 miles (10.9 km) of the main branch stream and tributaries in the Euclid Creek Reservation.
About 20 percent of this area is undeveloped, with 11 to 15 percent covered with impervious surfaces such as building rooftops, lawns, and parking lots.
The watershed here is largely natural, and is enclosed in a deep, broad valley whose walls are mostly bedrock.
Limited illegal dumping occurs in the park, and the creek's water quality is affected by polluted surface runoff from nearby residential areas after heavy storms.
Verbsky Creek, a roughly 1.5-mile (2.4 km) long tributary, joins the east branch just before the east branch's confluence with the main branch.
It runs west of Highland Road, crossing to the east of the street about 200 feet (61 m) east of the intersection of Georgetown Road and Hilltop Road.
It crosses Highland Road again and turns south between Highland Ridge Drive and Donna Drive, passing through and under residential developments.
Redstone Run, a 2.65 miles (4.26 km) stream, joins Verbsky Creek just before Verbsky Creek crosses east of Highland Road.
It travels east-southeast through a heavily forested ravine bordered by housing developments before turning south north of Hillcrest Drive.
Flowing through a series of culverts, tunnels, and open ditches, it crosses Highland Road just west of Karl Drive, flows southeast for about 250 feet (76 m), turns south and runs between Harris Drive and Catlin Drive for about 800 feet (240 m), then runs southeast to just north of the intersection of Jefferson Lane and Monticello Place.
It then travels east to Richmond Road, where its headwaters formerly began beneath what is now Richmond Town Square mall.

Subwatershed 3: Lower East Branch—This 12.5-square-mile (32 km²) area contains 7.8 miles (12.6 km) of the east branch stream and four tributaries in the cities of Richmond Heights and Highland Heights.
About 23 percent of this area is undeveloped, with 11 to 25 percent covered with impervious surfaces.
Euclid Creek flows through a ravine with steep hillsides in this subwatershed, which has largely discouraged alterations to the stream, banks, and adjacent riparian areas.
Residential development in this subwatershed consists primarily of single-family homes on large lots, which has kept impervious surfaces and population impacts low.
There is some water quality impairment due to illegal dumping (primarily along Chardon Road), se
The stream's watershed has seven distinctive subwatersheds. These are:
Subwatershed 1: Erie Plains in the Nottingham neighborhood—This 23-square-mile (60 km²) area contains 3 miles (4.8 km) of the main branch stream, between Lake Erie/Lower Euclid Creek Reservation and the Euclid Creek Reservation. About 6 percent of this area is undeveloped, and more than 25 percent is covered with impervious surfaces such as parking lots or buildings. The Lake Erie coastline and Euclid Creek lacustuary have been highly modified to accommodate bathing beaches, marinas, onshore developments, parks, piers, and other developments and uses. Marshlands and an oxbow have been removed, although partial floodplain and stream restoration have occurred. Between the park and Interstate 90, Euclid Creek is highly channelized, although a riparian zone exists on either side that shields the stream from the dense urban development adjacent to it. At Villaview Road, the stream enters a long tunnel that takes it beneath Interstate 90. It briefly emerges at E. 185th Street, where the St. Clair Spillway helps keep stream velocity low. The creek then enters a short tunnel to pass beneath the CSX railroad tracks. Between the railroad tracks and the Euclid Creek Reservation, much of Euclid Creek runs in a concrete channel completed as part of a flood control project. Shoaling (the accumulation of debris and sediment) has worsened in this area, reducing the effectiveness of the flood control measure. Extensive illegal dumping occurs in the creek between Lakeshore Blvd. and the Euclid Creek Reservation.
Subwatershed 2: Euclid Creek Reservation—This 10-square-mile (26 km²) area contains 6.8 miles (10.9 km) of the main branch stream and tributaries in the Euclid Creek Reservation. About 20 percent of this area is undeveloped, with 11 to 15 percent covered with impervious surfaces such as building rooftops, lawns, and parking lots. The watershed here is largely natural, and is enclosed in a deep, broad valley whose walls are mostly bedrock. Limited illegal dumping occurs in the park, and the creek's water quality is affected by polluted surface runoff from nearby residential areas after heavy storms. Verbsky Creek, a roughly 1.5-mile (2.4 km) long tributary, joins the east branch just before the east branch's confluence with the main branch. It runs west of Highland Road, crossing to the east of the street about 200 feet (61 m) east of the intersection of Georgetown Road and Hilltop Road. It crosses Highland Road again and turns south between Highland Ridge Drive and Donna Drive, passing through and under residential developments. Redstone Run, a 2.65 miles (4.26 km) stream, joins Verbsky Creek just before Verbsky Creek crosses east of Highland Road. It travels east-southeast through a heavily forested ravine bordered by housing developments before turning south north of Hillcrest Drive. Flowing through a series of culverts, tunnels, and open ditches, it crosses Highland Road just west of Karl Drive, flows southeast for about 250 feet (76 m), turns south and runs between Harris Drive and Catlin Drive for about 800 feet (240 m), then runs southeast to just north of the intersection of Jefferson Lane and Monticello Place. It then travels east to Richmond Road, where its headwaters formerly began beneath what is now Richmond Town Square mall.
Subwatershed 3: Lower East Branch—This 12.5-square-mile (32 km²) area contains 7.8 miles (12.6 km) of the east branch stream and four tributaries in the cities of Richmond Heights and Highland Heights. About 23 percent of this area is undeveloped, with 11 to 25 percent covered with impervious surfaces. Euclid Creek flows through a ravine with steep hillsides in this subwatershed, which has largely discouraged alterations to the stream, banks, and adjacent riparian areas. Residential development in this subwatershed consists primarily of single-family homes on large lots, which has kept impervious surfaces and population impacts low. There is some water quality impairment due to illegal dumping (primarily along Chardon Road), se
Euclid Creek