Downrigger and Line/Lure Depth

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Kokanee Learning
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Downrigger and Line/Lure Depth

Post by Kokanee Learning » Sat Aug 24, 2019 8:44 am

I recently bought a Fish Hawk X2 to better track lake temperature for kokanee. However, it has me thinking. The probe can tell the water temp. at the downrigger weight but where exactly is my dodger/lure. For example, If I let out 50/75/100 ft. of line before deploying the weight and then drop 30 ft. where is my lure at when trolling 1 to 1.5mph. Would it be lower or higher in the water column? I wonder if there's any sort of chart that explains weight of dodger/lure, ft. of line out and trolling speed to show how much the lure goes up or down the water column when attached to a downrigger. I may be overthinking this but wondered if anyone had any thoughts. Thank you.

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Sideburns
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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Mon Aug 26, 2019 4:41 pm

I troll with a wide variety of dodgers and terminal tackle in shallow lakes.... A lot. Many of my 4 inch oval dodgers with a similar looking front and back lip actually dive about 10 feet when pulled at those speeds. I have checked this by trolling over a 12ft deep area without bottoming, then later bottoming when trolled over a 10ft deep area. Most teardrop dodgers will actually rise somewhat (5 feet?) , its difficult to keep them under the water after letting your line out, some cannot be trolled above 1mph without weight (or downrigger) without surfacing.

Your lure behind the dodger has a massive effect on this depth though, but that's kinda complicated and dependant on dodger style. (for example, a teardrop dodger will rise higher with a large or heavy spinner that has a lot of drag in the water. To stop this rising effect, in the past I have added split shots above the dodger, just enough to keep it under the water.... then your downrigger reading is again accurate.

When the dodger is a known diving type, I just mentally add 10ft to the downrigger reading. When trolling deeper than 30 ft, I usually run a shorter 20-30 ft setback to alleviate this problem, and it makes turning while trolling much easier!

The lower setup pictured dives about 10ft and the upper setup probably rises 3-5 ft when trolled at 1.5mph with a 100ft setback before the downrigger ball.
dodger depth 1.jpg
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Sideburns
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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Mon Aug 26, 2019 4:46 pm

BTW...

I dont think your overthinking this, but the complexity here would make it very difficult to put in an easy reference chart.
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Kokanee Learning
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Re: Downrigger and Line/Lure Depth

Post by Kokanee Learning » Mon Aug 26, 2019 6:58 pm

Interesting, and thank you for the reply. Based on the temperature readings I get, 10 ft (even only 5) can make a drastic difference in the preferred temperature zone for kokanee. What you said makes sense. I was recently in a shallow lake and was pulling 'gunk' up on my lures even though I should not have been on the bottom, but close. Next time I go out I think I will try to greatly reduce the amount of setback I do. I have read it is preferred to have a longer setback because of the boat engine scaring the kokanee. I fish out of a kayak so hopefully that will help mitigate that.

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Sideburns
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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Tue Aug 27, 2019 9:55 am

Long setbacks are certainly beneficial sometimes. The deeper your fishing, the less this seems to matter. Kinda have to choose a balance point between the efficiency of a short setback and the stealthiness of a long setback. Ive been told that the rule of 100 works pretty well. (50ft down, 50 feet back or 20 feet down, 80 feet back etc) One of the reasons I try to run short setbacks whenever possible is that I like to dangle some kind of small rotating flashers and stick some reflective tape to the downrigger ball for added attraction.
When fishing crystal clear lakes, or fish are just spooked, I like to increase setbacks to keep the boat from visibly spooking the fish and also present the tackle a little further above the fish marks so that the downrigger gear doesn't do the same. I increase setbacks all the way up to about 200 feet max occasionally. Skip the downrigger ball attractors in clear water too.

Also remember that Kokanee and trout tend to strike at things above them. I usually like to try and present my gear 5 feet above the fish marks on the downrigger.

Where do you fish lately? I'm curious what your seeing for depth and temperature this time of year.
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Kokanee Learning
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Re: Downrigger and Line/Lure Depth

Post by Kokanee Learning » Tue Aug 27, 2019 6:49 pm

I only recently got the Fish Hawk X2. First I went to Alder, however; the fish hawk didn't work well there. I thought it may have been broke. The readings were very spotty. I think the water was very silty or something because I next took it to Ward Lake to verify it worked. It was fine there, I believe the preferred temp. of 52 was around the 30 ft or so mark, maybe a little deeper. I haven't had any luck for Kokanee at Ward though. Last weekend I drove to Deveraux Lake in Mason County. First time being there. The 52 degree mark was roughly 28 ft there. I really want to go to Merwin Lake, however it makes me a bit nervous in a kayak, even though I have a bigger one with a Pro Angler 12 if you are familiar with it. I know the water there can get rough. I need to start keeping a fishing journal to track the temps.

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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Tue Aug 27, 2019 11:16 pm

Last time I went to merwin, I shouldn't have ever left the launch! Spending most of the day searching the rest of the lake, we put gear back in just outside of the launch (speelai) and caught most of our fish. I think some should be starting to spawn by now at merwin though. Only been there a couple times myself, but havent seen rough weather yet.

Terrible website compared to NWFR...... [wink] ... but I follow this thread every year
https://www.ifish.net/board/showthread. ... 685&page=6

I'm curious how high in the water the 70 degree mark was? Trout cant tolerate much higher than that to feed. Do you remember what the deepest coldest temperature was? I fish a few similar size and depth lakes in the south king county area, with about 73 degree surface temps right now.

Thanks
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Re: Downrigger and Line/Lure Depth

Post by hewesfisher » Wed Aug 28, 2019 6:32 am

I chased this rabbit hole once, got all over the temp at depth thing, bought a Fishhawk TD so I could target preferred depth by temperature. I used the TD several times the first year, a couple times the second year, and hasn't been out of my tackle bag since. Have found my sonar tells me everything I need to know about where the fish are.

Great conceptual tool, but in my experience, far less practical in application. My $.02 for what it's worth. [wink]
Phil

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Sideburns
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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Wed Aug 28, 2019 11:05 am

Having never used one, 2 aspects of water temp measurement intrigue me.

1. These things seem like great learning tools. I'm curious how wide the "fishy" band is. I'm looking for 50-60 degrees for most species.... How wide is that area in 50 fow? Late summer, early summer change that? How much variation does it take to form a visible thermocline on sonar?
etc... etc... I'm sure after Ive got a grip on temperature patterns mine would end up in the bottom of the tool box too.

2. Verification. Is the band of visible thermocline on our fish finders even accurate? What temperature range does it form at? I would love to define and verify some of the thermocline sonar characteristics I've seen. Some lakes, one in particular, the visible thermocline band will regularly widen as it cools in the evening while disappearing in other parts of the lake. Whats going on there?

Ive pondered rigging up something myself with industrial thermocouple wire deployed on the downrigger for live temperature data. I think the Lowrance hds gen3 I just got will even display custom temperature gauges. That would be cool! Wow I'm a geek!
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Kokanee Learning
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Re: Downrigger and Line/Lure Depth

Post by Kokanee Learning » Wed Aug 28, 2019 7:48 pm

Your 2 cents is probably worth more than my 10 dollars :). I still have not mastered this kokanee thing but I would agree that a expert fisherman who knows what he is doing will out fish someone with more toys. I am still in that 2nd category though. My question wasn't so much about the X2 then about where my line/dodger was in relation to my downrigger weight. Sideburns - what lakes do you fish in south king county for Kokanee? Any particular one you would recommend?

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Re: Downrigger and Line/Lure Depth

Post by Sideburns » Mon Sep 02, 2019 12:18 pm

I use to fish Meridian and Sawyer for Kokanee. Then they all disappeared. Haven't seen a koke in Sawyer since 2008 and Meridian 2015. Meridian was hot in 2014 then not in 2015-2016. Dont know where they went, but wdfw still stocks both the same as they used to.
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