Three Rivers Ranch’s Newsfeed

Thank you for visiting our newsfeed.  You’ll find the latest news on the Henry’s Fork of the Snake River, fishing news from around Idaho, and other news from Three Rivers Ranch.

 

The great spring 2018 sediment flush continues to impact water quality and the fishing experience

Main message: The great spring sediment flush we observed earlier this year not only impacted fishing during Memorial Day weekend—by contributing to high flows and turbidity—but has continued to impact the fishing experience from Box Canyon through Riverside this season in two plainly obvious ways: depressed hatches and higher than average amounts of uprooted floating plant material. In addition, the rainy and cloudy weather that contributed to the spring flush may also have contributed to later hatch timing of some species earlier this summer. Recall my blog from June 8 where we quantified the amount of sediment that was flushed out of each reach of the Henry’s Fork, from Island Park Dam to Ashton Dam, during the major runoff events we experienced during April and May. These spring rains brought the highest spring runoff flows in 7 years to the upper Henry’s Fork watershed! Our network of water quality monitors showed that these flows were strong enough to provide a major springtime sediment flush—a natural rhythm of our local hydrology that provides significant benefit to trout and aquatic insect habitat. We’ve seen much higher summertime flows than these in the last 7 years, but what was significant about this spring’s

The great spring 2018 sediment flush continues to impact water quality and the fishing experience2018-08-02T08:07:36+00:00

Blog in response to Island Park flow transfer on July 15, 2018

Prepared by Melissa Muradian and Jack McLaren What happened? Due to warm water temperatures and low dissolved oxygen in the water at the intake to the Island Park hydroelectric plant, the plant’s aerators have been unable to maintain dissolved oxygen in power plant outflow above the level required by their operating license. Thus, the plant shut down yesterday morning (July 15), and all outflow from Island Park Reservoir was shifted to the bottom-withdrawal gates on the west side of the dam.   How does this affect the river’s water quality? Temperature: Water delivered through the dam gates is from the bottom of the reservoir and as long as thermal stratification remains in the reservoir, the gates will deliver cooler water than the power plant. However, the response we saw in temperature was about 1 ˚C (approx. 2 ˚F) at our IP East sonde. We saw no discernable difference in water temperature by the time that water made it to Pinehaven. Thus the cooler water temps that result from total flow coming out of the gates only last until some point upstream of Pinehaven, and most likely only last until part-way through Box Canyon. Dissolved Oxygen (DO): DO was hovering at

Blog in response to Island Park flow transfer on July 15, 20182018-07-17T08:06:49+00:00

Owyhee River Fishing Report – May 4 2018

PMD’s have started up in the mid-afternoon.  Nymphing has been most productive. Split-case PMD’s, Zebra Midges, Soft Hackles, & Pheasant Tails. Have fun and stop by TRR Outfitters in Eagle or call (208) 939-6065 to stock up on some flies, purchase your Owyhee fishing license, or book a guided fishing trip. Owyhee Reservoir Levels Owyhee River below the Dam Owyhee River near Rome, OR The post Owyhee River Fishing Report – May 4 2018 appeared first on TRR Outfitters.

Owyhee River Fishing Report – May 4 20182018-07-05T18:02:28+00:00

Boise River Fly Fishing Report – July 5, 2018

Boise River – In Town Fishing Report Flows have dropped!  Streamers have been pulling in big fish.  Try sculpin or baitfish patterns.  Nymphing hares ears, pheasant tails, copper johns, or zebra midges. South Fork of the Boise River  Fishing Report Salmon flies have started up the canyon.  Morman crickets have slowed down the topwater game.  Dry Dropper techniques have been working. Chubby to a Girdle Bug, Pheasant Tail, or Zebra Midges. Stop by or call our Boise Fly Shop for up to date information on where to fish and what to use. (208) 939-6065 Boise River Fish & Game Regulations Boise River - In Town @ Glenwood Bridge South Fork of the Boise @ Anderson Ranch Dam The post Boise River Fly Fishing Report – July 5, 2018 appeared first on TRR Outfitters.

Boise River Fly Fishing Report – July 5, 20182018-07-05T18:02:31+00:00

Henrys Fork, SF Snake, & Teton Fly Fishing Report – June 27, 2018

WE ARE HERE! The fishing season for 2018 has kicked off in style and timing. Most watersheds are right on schedule for the middle of June and reports are coming in very positive. Let’s discuss a few of the favorites. The good news is that The South Fork of the Snake has finally started fishing (remember last year? We are an entire month early!) The SF Snake River has experienced ups and downs, regarding the flows, and as of a week ago, they dropped the river to 13,000 CFS. The Palisades Reservoir is hovering at 100% which is why they bumped the flows up to 17,000  CFS (cubic feet per second) yesterday to do some damage-control. I have heard of many guides and private people seeing a ton of Salmon flies on the lower section and up through Conant, so we should see them up top within the week. Golden Stones will also follow this hatch during the next three weeks. The great thing during the next several weeks is that the green drake will also be busting! The Henrys Fork of the Snake River has been the name of the game during the past month. It has been fishing wonderfully

Henrys Fork, SF Snake, & Teton Fly Fishing Report – June 27, 20182018-06-29T06:02:03+00:00

2018 Henry’s Fork Population Survey Results

Every year the Idaho Department of Fish and Game (IDFG) conducts fish population surveys on various river reaches in the Upper Snake River region. In the spring of 2018, surveys were conducted on the Chester to Fun Farm, Vernon to Chester, and Box Canyon, reaches of the Henry’s Fork River. These surveys provide valuable information on abundance, age-class structure, fish size, and species composition within the fishery. IDFG recently published the results in their annual brochure and this blog will highlight and explain some of those results. Largest Rainbow Trout sampled during the 2018 population survey in th Box Canyon reach. Highlights Box Canyon Abundance estimate for fish greater than 6 inches in length: 2,796 Rainbow Trout per mile 2017 abundance estimate: 2,913 Rainbow Trout per mile Average length 10.1 inches 2017 average length: 11.5 inches Max length: 22 inches Abundance estimate of age-2 class fish was higher than predicted for a second year in a row (see below for more details)​ Chester to Fun Farm 1,225 trout per mile (727 Rainbow Trout and 498 Brown Trout) Average length Brown Trout: 15 inches Rainbow Trout: 14 inches Max length Brown Trout: 23 inches Rainbow Trout: 20.5 inches​ Vernon to Chester 1,612 trout per mile (1,071 Rainbow Trout and

2018 Henry’s Fork Population Survey Results2018-06-28T20:06:42+00:00

Henry’s Fork Days XXXIV – Membership Meeting Presentation

   Henry's Fork Days XXXIV - Membership Meeting At the annual membership meeting as part of our Henry's Fork Days celebration, HFF staff gave presentations on topics ranging from science and technology, outreach and education, and communications to stewardship and collaboration. Thank you to everyone who joined us for breakfast and presentations this year! We had a wonderful turnout and many great questions and points of discussion. The membership meeting was recorded and informational clips from each talk are forthcoming in a new HFF "educational series". In the meantime, we'd like to provide the slides from each presentation for those who were unable to attend or would like to take a second look. As always, please don't hesitate to give us a call or send us an email with any questions.  Below is a complete list of presentations.    Agenda and Presentation Slides Hydrology and water supply - Rob Van Kirk Market-based approaches to water conservation - Bryce Contor Status of Henry's Fork wild trout populations - Bryce Oldemeyer Water quality in the Henry's Fork and tributaries - Melissa Muradian and Jack McLaren Temporal and spatial trends in aquatic invertebrates, Youth Education programs, and Economic value of angling and river recreation -

Henry’s Fork Days XXXIV – Membership Meeting Presentation2018-06-26T08:06:26+00:00

Buffalo River Fish Ladder: 2018 Summary

Henry’s Fork Rainbow Trout migrating to spawn in the Buffalo River have to pass through the fish ladder at the Buffalo River hydroelectric facility to access upstream spawning habitat. At the end of the fish ladder we, HFF, operate a fish trap from early February through the middle of June. Three times a week we check the Buffalo River fish trap and collect data on species, length, sex, and life histories via passive integrated transponders (PIT) tags if one is present, before passing the fish upstream above the hydroelectric facility. This data allows us to quantify run size, run timing, number of spawners, number of return spawners, and other valuable information needed to monitor and understand the Henry’s Fork Rainbow Trout population. Last week (June 11, 2018) we opened the Buffalo River fish trap and concluded our monitoring of the 2018 Rainbow Trout spawning migration. Below is a quick summary of the 2018 data.   Buffalo River and Buffalo River fish ladder looking down stream from the hydroelectric facility. Notable Numbers   905 fish captured (February 16 through June 11) Rainbow Trout 112 spawning sized fish (greater than 12 inches) 15.8 inches - median size 23 inches - largest fish 576 juvenile fish

Buffalo River Fish Ladder: 2018 Summary2018-06-20T08:10:34+00:00

High turbidity and sediment event during Memorial Day weekend

The main message: Spring of 2018 brought the highest runoff event in 7 years to the upper Henry’s Fork watershed! Our network of water quality monitors showed that these flows were strong enough to provide a major springtime sediment flush--a natural rhythm of our local hydrology that provides significant benefit to trout and aquatic insect habitat. These favorably high natural flows came in two periods during April and May of this year. Unfortunately, the second period coincided with Memorial Day weekend—a reality that put a murky, cloudy, and disappointing damper on dry-fly fishing. So, why did this high flow and high turbidity event coincide with the Memorial Day weekend? Island Park (IP) Reservoir was already full when the watershed received over an inch of rain on May 23–24. The resulting increase in inflow was necessarily passed through IP Reservoir. For better or worse, IP Reservoir was not designed to discharge over the dam. Thus managers lack even the operational and mechanical option to pass the necessary flow over the dam. (Also this would flood the road over the top of the dam.) Bottom release does deliver more turbid water, but also much cooler water than from surface release. As many

High turbidity and sediment event during Memorial Day weekend2018-06-09T08:08:07+00:00