How high has the Spokane River flooded, and what does that mean for my home?
The record includes a December 1933 flood with about 47,800 cubic feet per second of water-surface data and a May 1894 flood described as the highest on record since gaging began. Recent crests include 28.73 feet in January 1974 and 25.50 feet in 2023. Any home in the flood-prone reach should plan for high water.
The Spokane County Flood Insurance Study names the December 1933 flood as the largest with water-surface data, and gives a May 1894 flood as the highest on record since gaging began. Those are the outer limits of the record, and they show that the river has reached very high levels in the past. The 1974 and 2023 crests are closer to living memory and are easier to picture on a street you know.
A crest figure tells you how high the river got at the gage, not how high it will get at your house. The ground, the drains, the grading and the floor level decide what reaches the building. Two homes a block apart can have very different damage from the same river rise.
What happened in the March 2017 river rise?
In March 2017 the mayor of Spokane declared a flooding emergency as the Spokane River approached near-record levels in the city reach. The declaration came at a time when snowmelt and rain had already closed many roads across Spokane County in February of that year.
A flooding emergency declaration means the river is high enough to change how the city responds, and it is a reason for homeowners in low ground to check their lower levels early. The declaration does not describe each house, and the damage in any one building depends on its floor level and its drains.
The February 2017 snowmelt and rain that preceded it also closed roads and affected basements. A Colbert resident's basement took water in February 2017, and the Hangman and Latah gauge at Spokane recorded a crest of 11.6 feet on February 17, 2017. Those events show the river and the creeks rising together in the same winter.
What affects the cost of river flood cleanup?
The depth of the water, how many floors and rooms it reached, how much silt came in, which materials must be removed, and how long the drying runs all change the work. The price is explained and approved on site before any equipment runs.
A river rise that reaches only a basement drain and a few inches of the floor takes less work than one that runs up the walls of the lower level, through the ground floor and into a garage. Silt adds cleaning time, and the removal of wet materials adds sorting time that the crew plans on the first visit.
The duration of the high water also matters. A river that stays high for days keeps the lower structure wet and the drying runs longer. The crew records the water level and the time it stayed, and the quote follows that record rather than a general figure.
What should I do when the river is high and my lower level is wet?
Keep away from standing water near outlets and the panel, switch off the power to the lower level if it can be done safely, and move valuables above the water line. Photograph the water level on the walls before anything is moved, and call for water removal.
River water can carry silt and debris, so do not wade through it, and wear boots and gloves if you must move items. If the water is above the first step of the stair, stay out of the lower level and wait for the crew, the utility or an electrician.
Keep a record of when you first noticed the water and where it came in. Photographs of the water line on the walls, the drain and the lowest point of the floor are the most useful things for the insurer, and they help the crew plan the work.
Will river water come back the next time the river rises?
It can, if the water still has the same route into the building. The cleanup removes the water that is in now, but the drains, the grading, the window wells and the foundation determine how the next rise reaches the house. The crew records the water path for a contractor to review.
A house on a low site can flood each time the river rises, because the ground around it saturates first. Raising the lowest floor, improving the drainage and sealing the openings are work for a qualified contractor, and the choice depends on your home and your site.
The Spokane County hazard mitigation plan describes flood declarations in 1956 and 1957, and the February 1996 flood reached the county too. Repeated declarations are a sign that a property in the floodplain may need to plan for the next event as well as the last one.