Skip to main content Homepage

Reported Obstructions and Alerts

Oregon's rivers are inherently dangerous, and some are prone to natural obstructions based on the topography and geology of the water basin.  The obstructions listed on this page will list rivers that consistently have log jams, strainers or other debris. 
During the winter and spring, debris flows and fallen trees are common.  By the summer, dropping water levels expose sunken logs and strainers, and the current often becomes stronger in the main channels on rivers and can take less maneuverable boats or inflatable inner tubes and float toys directly into the obstructions.  Take the time to plan ahead and scout the river before you put in. Expect sudden drop-offs into deeper water along reservoir and lake banks.  Always wear your life jacket.  
Inflatable floating devices (i.e. air mattresses, pool toys and inner tubes) are not designed for rivers and have limited directional control.  Please avoid using these devices for river recreation.

None reported at this time.

Fallen trees block a section of the river, downstream of the Mid-Drift boat laund and upstream of Bridge Drive access point.  Portage to RIVER RIGHT is necessary to get around the trees.  Depending on the water flows, these trees could lead to entrapment. Take early action to portage. 


​None reported at this time.

None reported at this time. 

Reported 7/10/2018  UPDATE: High water has moved the tree closer to a 45 degree angle and is underwater.  Marine Patrols will continue to monitor this obstruction. 

Signage posted at Ben and Kay Dorris, Rennie Landing and Siver Creek boat launch​.  

McKenzie reported obstruction 7/10/18

Large old growth fell from river left, downstream from Marten Rapid taking up 2/3 of river. Location is slow moving water and the hazard is easily visible from upstream. STAY RIVER RIGHT. Risk of possible entrapment.  Marine patrol officers will re-assess in the spring of 2019 if winter high water levels do not dislodge the tree downstream. 


Reported 6/29/18


300 feet downstream from Forest Glen boat launch

Large alder nearly completely across river from river right bank. Main channel flows over tree but will take boaters directly into two other strainers downstream. STAY RIVER LEFT!!!  


The McKenzie River Watershed Council posted the following information on their Facebook page on June 25, regarding the South Fork McKenzie River:

​PUBLIC NOTICE: Extreme Boater Hazard

South Fork McKenzie River - River Mile 0-1. Please avoid the South Fork McKenzie River downstream of the USFS Rd 19 Bridge June 25-August 15, 2018.

As part of the Lower South Fork McKenzie River Floodplain Enhancement Project, the lower mile of the South Fork McKenzie River (river mile 0-1) will be diverted into a floodplain side channel through a series of culverts and a narrow/low bridge. For your safety and the safety of Project personnel, please avoid floating in the South Fork McKenzie River downstream of the USFS Rd 19 Bridge.

For more information, contact Jared Weybright, McKenzie Watershed Council at, 458-201-8150 or Kate Meyer at the USFS McKenzie River Ranger District U.S. Forest Service - Willamette National Forest) at, 541-822-7230

The Lane County Marine Patrol reported an obstruction on 5/26/18, a large tree on river right in the main channel, approximately 1 mile downstream of Bellinger Landing.  The Marine Patrol cautions boaters and recommends taking out at Bellinger Landing. This obstruction is passable to non-motorized boats but as river levels continue to drop, this may not be passible soon.  There is a risk of entrapment.  Signage has been placed at nearby boat ramps upstream of the obstruction.  


​The Lane County Marine Patrol reported an obstruction on 5/26/18, a large tree on river right in the main channel, approximately 1 mile downstream of Bellinger Landing.  The Marine Patrol cautions boaters and recommends taking out at Bellinger Landing. This obstruction is passable to non-motorized boats but as river levels continue to drop, this may not be passible soon.  There is a risk of entrapment.  Signage has been placed at nearby boat ramps upstream of the obstruction. 

McKenzie River below Bellinger Landing

​None reported at this time.

UPDATE: 12/17/2018 -Upstream of the confluence of the North and South Santiam Rivers near Jefferson
One of the logs is just below the surface pointed downstream, not obstructing boat traffic. Boats are encouraged to avoid the area due to the large woody debris as water levels begin to rise with winter weather.  Large strainers are visible in shallower water.  


05/31/2018 -Fallen cotton wood trees are blocking a portion of the river near the confluence.  This location has historically been notorious for obstructions and boaters and recreationists are urged to avoid the area.  Signs have been posted at nearby ramps.  Due to water flows and the remote location of the obstructions, the Marion County Marine Patrol is unable to mitigate.  As water levels drop, they will attempt to remove what they can.  


05/17/2018 - Log jam reported between Buell Miller Ramp and Green's Bridge at the upstream end of Wiseman Island. The log jam at the head of the middle Wiseman Island channel has increased, and the gravel bar upstream of the log jam has encroached closer to the log jam. The only channel past the log jam is now less than 20 ‘ wide.  Two small logs from the jam extend more than half way across the channel just under the surface when the river flows are 4.5 at the Mehama river gauge.  When the river level drops to summer flows the location may be impassable to boats; boaters are advised to put in down stream of the obstruction.

North Santiam Log Jam reported 05/15/2018


The Bureau of Land Management reported two downed trees adjacent to Fisherman's Bend Park on 5/3/18.  One tree fell along the north river bank (river right) starting 1.5 miles west of the North 1st Avenue Bridge at Mill City.  THIS OBSTRUCTION WAS CLEARED on 5/11/18.  The second tree is river right in the main channel at mile 2.3 below the north 1st avenue Bridge at Mill City. The BLM is working on the best plan for mitigating the second obstruction and is coordinating with Marion County.  Boaters are advised to put in down stream of the obstruction.

North Santiam River Obstructions near Fisherman's Bend Park


North Santiam (44.685803, -123.004924)- Benton County Marine Patrol cut away a series of trees the best they could for safe passage of jet boats and drift boaters at the confluence of the North and South Santiam Rivers, upstream from Jefferson, OR.  This area is notorious for obstructions.  Most of the obstruction is river right going upstream, approximately 150 yards upstream from the confluence (pictured below).  One of the logs is just below the surface, so jet boaters and prop boats are encouraged to avoid the area due to the strainer and to protect their boats.  Sergeant Bottorff says, "Two ways to go through that stretch of river is to go over the log that is covered by about 6”-1’ of water towards the end of the log, or go to the left and zig zag past it when heading upstream.  Going downstream, the best path is to go over the log.  To go over the log, requires skills to read the water and jet boat experience."  Inexperienced boaters (motor, rafts and drift) should avoid the area and put in downstream of the confluence.  


UPDATE 5/18/2018:

The water has dropped leaving the log mostly exposed out of the water.  There is a passible spot to the left as described before.  This is a dangerous strainer and boaters are advised to use caution. 

North Santiam Log Jam updated 05/18/2018

North Santiam Log Jam updated 05/18/2018

North Santiam Log Jam updated 05/18/2018

North Santiam Log Jam updated 05/18/2018

Reported on 10/12/18 by the Jackson County Marine Patrol.  Mitigated on A fallen tree roughly 100 feet long and 24" wide with a root wad is in the Rogue River at 13473 Hwy 234, between Doughton Falls/Lyman and Nugget Falls.  After the obstruction was evaluated, trimming the the limbs was the best option to improve safety while providing fish habitat. Signs have been posted on the tree and at nearby ramps. Keep a sharp lookout. 

Fallen tree on the Rogue River reported 10/12/18

GPS Coordinates of fallen tree on Rogue River

​The river is being scouted for obstructions by the Clackamas County Marine Patrol. 

​None at this time.

​A fallen tree was reported on the Tualatin River, upstream from Fields Bridge in West Linn, behind 23044 SW Ulsky Rd.  This area is used primarily by paddlecraft and is passable.  The tree is also visible.  

The Tualatin Riverkeeper reported five separate log jams to the Washington County Marine Patrol who forwarded the information to the Marine Board. 

The log jams are in the following locations along the Tualatin River:

Near 9545 SW River Rd -LAT/LONG: -122.940 / 45.470226

Near 5220 SW Rood Bridge Rd: -122.940954 / 45.483887

Near 3995 SW Rood Bridge Rd: -122.952185 / 45.489920

Near 29365 SW Hillecke Rd: -122.975837 / 45.481148

Near 4570 SW Minter Bridge Rd: -122.978874 / 45.484550

In all of these log jams, law enforcement report that boaters cannot safely navigate around the obstruction and portage may not be possible.  In many of these log jams, there's a large volume of trees. Boaters are urged to plan ahead and avoid these areas.  

​OSP reports exposed pipe, probably from an old dock, that's exposed during low water flows.  OSMB will work with law enforcement to sign nearby ramps.  The pipes appear to be 9' vertical and 3"+ in diameter near the waterline.   This area is popular with motorized boaters.  

​None reported at this time.

One Mile above Clearwater Boat Ramp

Partially mitigated on 7/16/2018 by Lane County Marine Patrol.


Lane County Marine Patrol reported a downed tree one mile above the Clearwater boat ramp but flows into a sweeper.  The Marine Patrol deputies were able to cut away some of the tree limbs to improve passage on 7/10/18.  Nonmotorized boaters are encouraged to keep a sharp lookout and to stay river left to avoid being pulled into what remains of the tree.  


Hileman County Park Boat Ramp

Paddlers reported a strainer downstream of Hileman County Park/Boat Ramp below the confluence of the McKenzie River on the side channel entering the main channel.  A log is on river left but the current carries paddlers to the right, into a log jam.  This was a close call for the paddlers, who were pinned but able to climb out to safety.  The Lane County Marine Patrol unit is assessing the obstrution for potential mitigation and recommendations for boaters.  Less maneuverable boats and inexperienced paddlers are encouraged to stay in the main channel.  These paddlers advise wearing life jackets and are grateful they wore theirs.  We will post updated information when we hear back from the marine patrol. -44.141065, -123.122286


Coast Fork Willamette River

A boater reported an area of concern to the Lane County Marine Patrol on December 20, 2016.  The marine patrol report that this is an earthen dam (low head) with judraulic effects during high water.  The normal chute for passage is difficult to see.  Boaters should be able to navigate over any area of the earthen dam or portage around.  Boaters are urged to pay close attention and oar-through the area to avoid getting trapped. 43.864827, -123.0209788 


Brown's Landing Willamette River

Drift boaters who takeriver left may be drawn into the debris by the current. Take the river right channel, which is the first visible route when heading up or down stream. 44.1898627, -123.153338

Below Dexter Dam, Willamette River

A 1920's-era excavator fell into the river from an undercut banl below Dexter Dam.  The land is privately owned and there isn't safe portage.  A private contractor is required to remove the structure.  Signs are posted upstream to the dam alerting boaters of the structure.  Boaters are urged to avoid this area.  43° 57'38.03"N, 122° 51'57.46"


​Approximately five miles downstream from Sarah Helmick State park at the PNWR railroad bridge.  There is a large log jam blocking the river at the railroad bridge.  Porgage over the logs is potentially dangerous depending on water flows.  Please use caution when navigating this section of river due to large woody debris.  Entrapment or capsizing is possible. 


Boat Safe Fish Sticker 


ORS 830.160 Board authority to remove obstructions from water: The State Marine Board may cause the removal of any obstruction consisting of logs, rocks or other debris resulting from natural causes from the waters of this state if the board finds the obstruction to be an extraordinary hazard to boating safety.  The board may pay the cost of such removal from amounts reserved therefore in the account created by ORS 830.140.  

DISCLAIMER: Obstruction removal is ultimately the responsibility of the property owner.  The agency, along with marine law enforcement may work with property owners on mitigation plans. The agency will selectively mitigate obstructions based on the location, type of boating traffic/frequency, ability to mitigate using equipment from land/water and meeting the definition of "extraordinary hazard" to boating safety.  Rivers are dynamic and high water events frequently change the location of obstructions. Downed trees and other debris also provide important habitat for fish and marine life.  Each obstruction is evaluated individually after consultation with Marine Law Enforcement.  Where practical, marine deputies may attempt to create safe passage with recommendations for boaters, in addition to posting signage at nearby ramps.  It's the boater/floater's responsibility to scout ahead, keep a sharp lookout and take early and substantial action to avoid being taken by the current into an obstruction.   

Your browser is out-of-date! It has known security flaws and may not display all features of this and other websites. Learn how