OHA Drinking Water Services
OHA Drinking Water Services
Contact Report Details

PWS ID: OR41 00657
PWS Name: PORTLAND WATER BUREAU
 
Who Was Contacted: Ann Levy
Contact Phone: 503-823-6135
Contact Date: 04/11/2018
Contacted By: GENTRY, CARRIE (DWP)
Contact Method/Location: Phone
 
Assistance Type: INCIDENT RESPONSE
Reasons: Operations
 
Details: Ann called on April 4 to report that there may be a beaver present in the diversion pool. Headworks noticed peeled sticks and a downed sapling over the weekend. No one saw the beaver but scat was visible in shallow water. Samples were sent to lab for crypto testing. Certified pest control contacted and trap was set up Monday night but nothing was caught. Wildlife camera were set up and gate left ajar in case the beaver wanted to leave.

After two nights of trapping, there were no signs of beaver. Management discussed what next steps were (more traps etc.) Past beaver watershed crypto data since 2013 indicated that out of 59 samples, 3 were positive. The last beaver incident in area was in 2005, before that it was the late 1990s. It is unknown how it got into the diversion pool although one theory is that it could have climbed the spillway.

PWB planned to increase trapping - it may have been holed up under the boulders. Sample results from scat were available later on April 4: 2 samples were negative, and the presence of the beaver was visually confirmed. Tried to trap the beaver over the weekend and encourage it to exit.

April 9 : Camera caught the beaver leaving the area Thursday night and then returning. On Friday night, the camera caught the beaver leaving the area and not returning. PWB collected additional scat last week and shipped the sample out Friday to check for crypto and giardia.

April 11: sample results were negative for crypto and giardia.


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