Stream Bank Erosion by Gee Creek Trail

                         The stream bank has receded in several places and threatens the new trail

The stream bank along sections of the new trail from Division Street to Heron Ridge Drive has areas that are eroding badly.  In mid- October the section in the photo had only one small section that had collapsed next to the silt fence.  Last weekend things began to get much worse, and on Tuesday, many sections of stream bank began to collapse in several places over a distance of 400 feet or so.  Gee Creek has not had high flows yet so that is not the cause of the sudden collapses.  We had a severe drought last summer that dried the soils here, and we’ve had enough rain to finally wet the soil.  This may be making it heavier and softer and is exacerbating the stream bank collapse from the stream undercutting the bank.   Public Works Director Bryan Kast indicated yesterday that a hydrologist consultant is working on getting some stream bank stabilization done here before the end of the year.

We are now getting into the wettest time of the year.  With soils saturated and higher stream flows on Gee Creek, it may be very difficult to get any stabilization done.   It’s mid-November and we have several more months of possible wet weather with  higher stream flows.  In several areas the changes to the stream bed are forcing water into and along the stream bank itself.  The best hope is to get through the  wet season and then look to find a way to make a real fix.  Unfortunately, a real fix over such a great distance could be very expensive

Another area of bank collapse:  Note how flow is undercutting bank

About Paul Snoey

I have a degree in Biology and Environmental Science from WSU Vancouver
I am very fond of Gee Creek and Allen Canyon Creek and do a lot of volunteer work to restore these creeks.

Comments

  1. lisachemarin@aol.com says:

    I’m sure everything is being looked at but what about engineering with nature such as with a brush mattress: https://www.fema.gov/pdf/about/regions/regionx/Engineering_With_Nature_Web.pdf See page 18. Or logs to buy time?

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