On the Site:


Brigham City officials trying to find the cause of dead fish at Mantua Reservoir

Oct 10, 2023, 6:27 PM | Updated: Oct 11, 2023, 10:36 am

MANTUA – Hundreds of dead fish are floating in the Mantua Reservoir. 

This comes after the lake was treated for algae blooms. But city workers say they can’t be sure whether those chemicals had anything to do with what’s happening now. 

Workers with Brigham City estimate about 300 fish are dead. They’re working with a group of scientists to try and get some answers. 

Still, the water at Mantua Reservoir is a lot less green and more clear. 

“Absolutely. It’s almost too clear right now,” said Ted Grove, who says the water can make fishing a little more difficult. 

Mike Anderson (KSL TV)

But then there’s the other thing people can easily see through the water. 

“Yeah there’s been a lot of dead trout, so that’s a little concerning,” Grove said. 

He’s not the only one who’s noticed. 

Pilot study at Mantua Reservoir

Just last month, scientists with Blue Green Water were at the reservoir running a pilot study of a solution they say essentially oxygenates the algae blooms, which causes them to die without harming the wildlife. 

Glen Palmer says he is hoping no more fish were affected. 

“I hope it didn’t kill all the fish. That’d be sad,” he said. 

Palmer says while he does worry about what he’s seeing, he’s hesitant to jump to any conclusions. 

“That’s a normal thing when they plant fish, so many of them don’t survive,” he said. 

The Utah Division of Wildlife Resources just planted about 10,000 trout at the reservoir.

It’s not uncommon for a small percentage to die in the process. However, Brigham City workers and scientists want to be sure. 

What officials have to say

Derek Oyler, Brigham City administrator, said the one thing workers have found is less oxygen than they’d normally find in the water this time of year. 

“We can’t determine whether that’s just a normal die-off or whether the lower dissolved oxygens are maybe what’s causing it, but we’ll continue to work on that,” he said. 

In the meantime, Grove said from what he’s seen the bass are still healthy here. He’s hopeful those water treatments will eventually lead to a healthier future for one of his most frequented fishing spots. 

“I wouldn’t say favorite, but it’s close and easy. I call it cheap thrills,” he said. 

Read more:

‘Fishy’ mystery: Utah family discovers 16 dead fish in their backyard

KSL 5 TV Live

Local News

In the moment they feel like small purchases, right? An ornament here. A stocking stuffer there. A ...

Matt Gephardt

How you can avoid holiday debt despite the pressure to spend

In the moment they feel like small purchases, right? An ornament here. A stocking stuffer there. A last-minute office gift. But all this can quickly add up to a financial holiday hangover. And perhaps it’s one you’re still feeling from the last holiday season.

4 hours ago

The inversion as seen from Salt Lake City on Nov. 29, 2023. (Jack Grimm, KSL TV)...

Debbie Worthen and Mary Culbertson, KSL TV

Utah leaders face uphill battle on clean air before 2034 Olympic Games

Part of Utah's agreement with IOC requires clean air for the Olympic Games in 2034 if Salt Lake is to host. Leaders have ambitious plans for the next decade in attempt to make it happen.

4 hours ago

A picture of Powder, the official Olympic mascot in 2002, who was played by Heather Mickey, picture...

Mary Culbertson and Andrew Adams, KSL TV

2002 Olympic mascot reflects on her time as Powder after big announcement

An official Olympic mascot looks back on her time during the Games in 2002, and talks about what excites her for 2034.

4 hours ago

American Preparatory Academy on Nov. 29 after it was evacuated for carbon monoxide fumes found in t...

Mary Culbertson and Lauren Steinbrecher, KSL TV

Potentially 45 preschoolers and 10 adults exposed to carbon monoxide at American Prep Academy

Five toddlers and five adults were taken to the hospital after being exposed to carbon monoxide at American Preparatory Academy.

6 hours ago

(KSL TV)...

Lindsay Aerts

Student accused of attacking Kearns High teacher has special needs, district says

The Granite School district is now investigating what it calls an “egregious” attack on a teacher in the classroom. That teacher is said to be recovering, as is an Assistant Principal and a resource officer who assisted the teacher.

8 hours ago

(KSL TV)...

Shelby Lofton

Park City vet thinks he’s treated dogs with mysterious respiratory illness

A Park City veterinarian suspects he has treated dogs with a mysterious respiratory illness reported in other states, but a state veterinarian says Utah still has no confirmed cases.

8 hours ago

Sponsored Articles

Stylish room interior with beautiful Christmas tree and decorative fireplace...

Lighting Design

Create a Festive Home with Our Easy-to-Follow Holiday Prep Guide

Get ready for festive celebrations! Discover expert tips to prepare your home for the holidays, creating a warm and welcoming atmosphere for unforgettable moments.

Battery low message on mobile device screen. Internet and technology concept...

PC Laptops

9 Tips to Get More Power Out of Your Laptop Battery

Get more power out of your laptop battery and help it last longer by implementing some of these tips from our guide.

Users display warnings about the use of artificial intelligence (AI), access to malicious software ...

Les Olson

How to Stay Safe from Cybersecurity Threats

Read our tips for reading for how to respond to rising cybersecurity threats in 2023 and beyond to keep yourself and your company safe.

Design mockup half in white and half in color of luxury house interior with open plan living room a...

Lighting Design

Lighting Design 101: Learn the Basics

These lighting design basics will help you when designing your home, so you can meet both practical and aesthetic needs.

an antler with large horns int he wilderness...

Three Bear Lodge

Yellowstone in the Fall: A Wildlife Spectacle Worth Witnessing

While most people travel to this park in the summer, late fall in Yellowstone provides a wealth of highlights to make a memorable experience.

a diverse group of students raising their hands in a classroom...

Little Orchard Preschool

6 Benefits of Preschool for Kids

Some of the benefits of preschool for kids include developing independence, curiosity, and learning more about the world.

Brigham City officials trying to find the cause of dead fish at Mantua Reservoir