South Side is an earth dam located in Larimer County, Colorado, built in 1921. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 31 ft31 ft tall and 630 ft long, taller than 72% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About South Side
The primary purpose of South Side is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by South Side Reservoir Company (steve Mcmillan, Trea (private). It impounds the Big Thompson River-tr near Loveland.
The dam stands 31 feet tall and stretches 630 feet across, creates a reservoir covering 66 acres, has a maximum storage capacity of 1,019 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1921, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 08/03/2021.
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Location
| State | Colorado |
| County | Larimer |
| Nearest City | Loveland |
| River/Stream | Big Thompson River-tr |
| Coordinates | 40.36802, -105.11049 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 31 ft |
| Dam Length | 630 ft |
| Year Completed | 1921 (105 years old) |
Storage & Hydraulics
| NID Storage | 1,019 acre-ft |
| Max Storage | 1,019 acre-ft |
| Normal Storage | 658 acre-ft |
| Surface Area | 66 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 4,930 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | South Side Reservoir Company (steve Mcmillan, Trea |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 08/03/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | CO01195 |
| Federal ID | CO01195 |
| More Info | State Dam Safety Program |