Jackson Hydroelectric Project

[1] Beginning operations in 1984, the project aims to bring clean and renewable hydropower to Snohomish county.

The facility consists of a single powerhouse, two main generating units, a switch-yard, and transmission lines—all of which are directly connected to the county's local 115 kV power-transmission network.

[2] The largest generating station operated by the Snohomish county PUD, the Jackson Hydro powerhouse has a total nameplate capacity of 112 megawatts, enough to power 53,200 homes, and accounts for 7 percent of the Snohomish county PUD's total power needs.

The second phase was completed in 1984, when the Culmback dam was raised an additional 62 feet, quadrupling the water capacity of Spada lake.

The Spada lake reservoir currently covers 1,870 acres, with a maximum normal elevation of 1,450 feet.

The Jackson Hydro powerhouse, with the outflow into the Sultan river visible beneath.
The step-up transformers behind the powerhouse, boosting the generator voltage to 115,000 volts for transmission.