Lower Parking Lot Address:
37479 SE Fish Hatchery Rd, Fall City, WA 98024

Directions from the main Snoqualmie Falls parking lots:

Turn left out of the paid Falls parking lot onto SE Fall City-Snoqualmie Road
OR
Turn right out of the free Falls parking lot onto SE Fall City-Snoqualmie Road

Note: Do not drive under the walking bridge. Drive the opposite direction.

Then:

Travel 1.5 miles toward Fall City
Turn left on 372nd Ave NE
Travel 0.3 miles
Turn left on Fish Hatchery Road
Travel 0.5 miles on Fish Hatchery Road
Arrive at Lower Lot

Directions from downtown Fall City:

Follow WA-202 E/SE Redmond-Fall City Rd to cross Snoqualmie River
At the traffic circle, take first right onto WA-202 E
Travel 2.3 miles toward Snoqualmie Falls
Turn left on 372nd Ave NE
Travel 0.3 miles
Turn left on Fish Hatchery Road
Travel 0.5 miles on Fish Hatchery Road
Arrive at Lower Lot