Mo Didy at Bow – Gates are Open

| May 16, 2009

The dreaded Didymo has finally reared its slimy head at Broken Bow Oklahoma. Add that to the recent torrential rains hitting Oklahoma, and it’s a recipe for a decline that will probably last for the next few months at a location well known to Dallas-Fort Worth area fly fishers for its quick trout fixes. And the alarms are going off for other Oklahoma sites like the Blue River.


TFC can’t take credit for the following information or its inaccuracies, but the frenzied concern is in full swing.

MAY 14 –
From Sid Ingram of Beavers Bend Fly Shop,
“The stoplogs were removed last night. This morning I was told to expect the spillway gates to open by noon…. That did not happen.. This evening I was told that the powerhouse was running both units (full tilt)…
All access to spillway creek, lost creek, evening hole, riverbend area have been blocked off… Fishing is NOT an option… The entire river is either closed by barracades or high water… Cancel your trip if you were planning on fishing this weekend… Sorry! ”

Friday, 15 May 09 at 7:15 a.m.
Pool Elevation = 627.23 feet.
New Gate Discharge was 2642 cubic feet per second.
New Gate Settings:
1 Low Flow Valve open 12.00 PERCENT
8 Tainter Gates open 0.25 FEET
Friday, 15 May 09 at 0:30 a.m.
Pool Elevation = 627.19 feet.
New Gate Discharge was 1370 cubic feet per second.
New Gate Settings:
1 Low Flow Valve open 12.00 PERCENT
2 Tainter Gates open 0.50 FEET ”

“Broken Bow area has had more than 16 inches of rain this month. They are opening up the spillway today. And when they did this last year, it was opened for 3 weeks. Zone one will be closed today, and for how ever long they keep the spillway open and flowing. All those big fish we had caught are going to get pushed down river. This is not good. Last time, the flyshop in the park almost went down, as did many structures, benches, and a lot of the man-made structure. I guess the only good thing could be the flooding will push out the didyomo.” — DM


While fishing the Lower Mountain Fork On Thursday, 4/23, I was advised by a biologist for the State of Oklahoma that the Lower Mountain Fork
River has invasive algae called Didymo. I personally saw evidence of this algae from the Cold Hole to the upper Evening Hole. There is no
reason to believe that it hasn’t spread to a much larger area of the river system. This algae was probably transported to the river by way of
wading felts, boots, gravel guards, wading staffs or any other devices that it could stay alive on while being transported from one stream to
another. This algae has been in existence in some rivers in Arkansas for at least a year. A common name for this algae is “Rock Snot”. It
attaches to rocks and can be seen attached to the end of hooks looking like a whitish gray blob. By searching didymo algae you can learn all
you want about it. Since this information is being sent to at least four organizations with hundreds of members, the State has requested that
you please not try to contact them. As additional information becomes available I will pass it on. The main concern at this point is that you
do not transport it to other non affected rivers such as the Blue, Guadalupe, or any other river you may fish. The state indicated that it plans to post warning signs of the existence of this algae in the affected areas. What you can do is thoroughly clean all your equipment immediately after returning from a trip to the Lower Mountain Fork. – GLEANED from DM e mail

Before you leave a river or lake, check items and leave debris at site. If you find any later, treat and put in rubbish. Do not wash down drains.

There are several ways to kill didymo. Choose the most practical treatment for your situation which will not adversely affect your gear.
Non-absorbent items
Detergent: Soak or spray all surfaces for at least one minute in 5% dishwashing detergent or nappy cleaner (two large cups or 500 mls with water added to make 10 litres); or

Bleach: Soak or spray all surfaces for at least one minute in 2% household bleach (one small cup or 200 mls with water added to make 10 litres); or

Hot water: Soak for at least one minute in very hot water kept above 60 °C (hotter than most tap water) or for at least 20 minutes in hot water kept above 45 °C (uncomfortable to touch).
Absorbent items
Absorbent items require longer soaking times to allow thorough saturation.
Hot water: soak for at least 40 minutes in hot water kept above 45 °C; OR
Hot water plus detergent: soak for 30 minutes in hot water kept above 45 °C containing 5% dishwashing detergent or nappy cleaner; OR
Freezing: Freezing until solid
Freezing any item until solid will also kill didymo.
Drying will kill didymo, but slightly moist didymo can survive for months. To ensure didymo cells are dead by drying, the item must be completely dry to the touch, inside and out, then left dry for at least another 48 hours before use.

Relying on ambient drying as a stand-alone treatment for decontaminating highly absorbent risk goods is not recommended in situations where use between waterways is frequent (daily, weekly or even monthly).

Drying should only be relied upon as a decontamination treatment if great care is taken to actively and completely dry the material (such as by using a heat source where temperatures around the felt are assured of reaching 30 °C). Once the material appears dry, complete dryness must be confirmed by a tactile inspection of the base of the fibres. Once completely dry, items must remain dry for at least 48 hours before use in another waterway.

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Category: Causes, Fishing Reports, Oklahoma Report

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