Posted in Citizen Science Rock Run

Rock Run Water Tests 12.2.23

Rock Run
Rock Run 12.2.23

Recent rains have pumped up the volume of Rock Run on this Saturday, the final water test of 2023.

Air Temp – 53° F
Water Temp – 45.5° F
pH – 6.9
Alkalinity – 6.1
Linn Run Discharge – 16.1 ft³/sec
Linn Run Gauge Height – 1.98′

pH and alkalinity averages are down slightly from 2022, but considering a pH reading of 4.7 was recorded at this loctation in 2005 we can rest assured our limestone sand project has had a overall positive impact on the stream.

Posted in Citizen Science Rock Run

Rock Run Water Tests 10.28.23

Water tests at the mouth of Rock Run were done on what may be the last “nice” Saturday of the year.

Air temp was 63° F
Water Temp – 55.5° F
pH – 7.1
Alkalinity – 10.0
Linn Run Gauge – 1.9 ft
Linn Run Discharge – 9.65 ft³/sec

Linn Run
Linn Run October 28, 2023
Posted in Citizen Science Rock Run

Rock Run Water Tests 9.30.23

Goldenrod is everywhere in early fall, even along mountain trout streams

Here’s the results of water tests at the mouth of Rock Run.

Air Temperature: 59°F
Water Temperature: 56.5°F
Linn Run Gauge: 1.64′
Linn Run Discharge: 3.68 ft.³/sec
pH: 6.9
Alkalinity: 9.2
Flow: Low/Clear

The streams had decent flow, but we could use some rain to allow trout to move upstream to spawn.

Posted in Citizen Science Rock Run

Rock Run Water Tests 8-31-23

White Snakeroot
White Snakeroot in bloom along Rock Run

Here’s the water test results for August 31, 2023:

Air Temperature: 68°F
Water Temperature: 60.5°F
Linn Run Gauge: 1.85′
Linn Run Dischrge: 9.65 ft³/sec
pH: 7.1
Alkalinity: 8.2

Posted in Citizen Science Rock Run

Rock Run Water Tests 7.29.23

Rock Run 7-29-23
Neither rain nor snow....The mouth of Rock Run looks like a boreal rain forest in this shot from the rainy morning of July 29, 2023.
Linn Run Turbidity
Linn Run running uncharacteristically turbid (fancy word for muddy) after a rainstorm
pH Monitor
Perfect pH 7.0 recorded on this meter.

Citizen Scientists were met with a downpour for monthly water tests at the mouth of Rock Run on July 29. The (much welcome) rain forced a quick sample collection and tests conducted in the pavilion at Adams Falls.

The results:
Air Temperature: 68°F
Water Temperature: 63.5°F
pH: 7.0
Alkalinity: 6.7
Linn Run Gauge: 1.85′
Linn Run Flow: 9.65 ft³/sec

Despite the hottest day of summer on the previous day, Rock Run flows at a trout healthy 63.5 degrees.

Posted in Citizen Science Conservation

Rock Run Water Tests for July 2023

The testers were greeted with heavy rain on the morning of July 1, but the skies soon cleared and they were able to conduct monthly water tests at the mouth of Rock Run.

The storm raised water levels from 1.9′ to 2.0′ in less than an hour and with additional rain later in the day peaked at 3.93′ with a flow rate of 565 ft.3/sec at 9:30 pm.


Here’s the test results as of 10:30 am, Saturday, July 1:

Air Temperature: 65°F
Water Temperature: 59.5°F
pH: 7.0
Alkalinity: 7.7
Linn Run Gauge: 2.0′
Linn Run Discharge: 13 ft³./sec

Alkalinity was surprisingly good considering the influx of rain water.

Afterwards, we went up to the headwaters and checked on the limestone sand that was placed in the stream last year.
It is estimated that 90% has been washed down into the stream. We shoveled the remaining sand in closer to the water.

Linn Run Turbidity
Linn Run running uncharacteristically turbid (fancy word for muddy) after a rainstorm
Remaining limestone at one of three sites in the Rock Run headwaters
Shoveling limestone
Shoveling remaining limestone in closer to the stream
Linn Run Storm
A break in the clouds after a downpour at Linn Run State Park
Posted in Citizen Science Rock Run

Rock Run Water Tests For June

Rhododendron is in bloom along Linn Run

Monthly water tests were conducted at the mouth of Rock Run on Saturday, June 3.

Water Temperature – 57.5°F
Air Temperature – 66°F
pH – 7.2
Alkalinity – 6.1
Linn Run Gauge – 1.65′
Linn Run Discharge – 3.54 ft³/sec

Hot, dry weather has come early to the Laurel Highlands this year, however, there was a lower flow recorded in June of 2020 when the Linn Run gauge was at 1.42′. Some rain would be nice though.

Posted in Citizen Science Rock Run

Rock Run Water Tests 4-29-23

Rock Run April 29, 2023

Here’s the results of water quality tests at the mouth of Rock Run on April 29, 2023.

Air Temperature: 54°
Water Temperature: 48°
Linn Run Gauge: 1.97′
Linn Run Discharge: 15.5 ft³/sec
pH: 7.45
Alkalinity: 5.0

Posted in Citizen Science Rock Run

Rock Run Water Test Results April 2023

Rock Run April 2023

Here’s the results of water quality tests at the mouth of Rock Run
on April 2, 2023.

Air temp: 30°F
Water temp: 41°F
Linn Run Discharge: 20.6 ft³/sec
Linn Run Gauge: 2.09
pH: 7.7
Alkalinity: 3.3
Flow: med/high and clear

Posted in Citizen Science Conservation Linn Run

Linn Run Conservation Plan Released

Forbes Trail Chapter of Trout Unlimited debuted their final Linn Run study results at a public meeting on March 30, 2023, at the Powdermill Nature Reserve.   Thirty-five guests were present to learn about the overall health of Linn Run watershed and what threats to the stream need to be addressed.

The study began in April of 2021 and was funded with a grant from the Foundation for Pennsylvania Watersheds, a grant-making foundation that invests in efforts to protect healthy, natural streams around the state.  The study was a “partnership” effort involving state and local agencies and nonprofit organizations, each bringing unique expertise to the table.  Nearly fifty volunteers, including TU members, citizen scientists and professional chemists and entomologists worked on the project for nearly two years.

The specific studies looked at the water quality including potential pollutants such as E. coli, iron oxide, road salt and aluminum which can harm all aquatic life.  Extensive sampling done for macroinvertebrates (trout bugs), showed that the main stem and the major tributaries all had a healthy variety and number of bugs.  

Teams of volunteers conducted habitat assessments looking at every inch of the stream and tributaries from the first raindrop on Laurel Mountain to where Linn Run passes under the Rt. 381 bridge in Rector.  Bank erosion from flash floods, hiking trail washouts, log jams and barriers restricting fish movement were some of the problems discovered.  The Hemlock Woolly Adelgid (HWA), a tiny insect that infects the needles of hemlock trees, has been documented and could threaten the canopy over nursery waters.  

A limestone treatment system installed on the largest tributary, Rock Run, in 2005 has proven to be effective at raising both the pH and alkalinity of the tributary to where it now supports wild trout reproduction.  A similar treatment system might be considered for the headwaters of Linn Run.

The Coldwater Conservation Plan is part of a “process”. The next step will be for TU to meet with partners such as the State Park and Forbes State Forest officials to determine what remediation efforts DCNR might be able to work into their budgets and maintenance plans.  Then, decide if grants and more manpower might be needed.  Some activities such as clearing log jams after severe floods and monitoring for E. coli, the HWA and gill lice is expected to be an ongoing exercise by the partners.  

Overall, Linn Run is a relatively healthy, but somewhat fragile, high gradient mountain stream.  It and the surrounding park and forest attract well over 100,000 visitors each year.  Linn Run is the “crown jewel” of the watershed and the Partners are committed to Conserving, protecting and restoring it using whatever resources are needed. 

Andrea Presentation
Andrea Kautz, Entomologist and Lab Manager for Powdermill Nature Reserve explains the type and number of macroinvertebrates recovered on Linn Run.
Monty Presentation
Monty Murty, past chapter president and designer of the study, explains some of the water quality problems discovered.