As the water level in the Cowlitz River climbs, here is what you can expect. At:
19.5-feet: Bank Full Level Water flows along its normal banks and is well below the top of the levee.
21.5-feet: Flood Stage The water level is still below the levee but CDID #1 begins to monitor the river more closely. Low lying and secondary roads begin to flood in certain unleveed areas.
24.5-feet: Moderate Flood Stage The risk of flood potential is increasing and CDID #1 increases its effort to monitor both the river and the levee conditions.
28.5-feet: Major Flood Stage Numerous roads are flooded and some levees are subject to erosion and overtopping.
The lowest elevation on CDID #1’s Cowlitz River levee is approximately 32-feet near the Hall of Justice. CDID #1 has the material and equipment on standby to close the levee at Fishers Lane and temporarily raise the levee at the Hall of Justice, if needed.