Integrated Status & Effectiveness Monitoring Program

Expansion of Existing Smolt Trapping Program in Nason Creek\
by Yakama Nation Fisheries Resource Management

**2004 Draft Annual Report**

Prepared by:

Scott A. Prevatte

Keely G. Murdoch

Prepared for:

\# 2003-017-00

Bonneville Power Administration

Portland, OR

YAKAMA NATION

FISHERIES RESOURCE MANAGEMENT

![](media/image1.jpeg){width="1.2604166666666667in"
height="1.5618055555555554in"}

# 

#  {#section-1 .unnumbered}

# Abstract

In the fall of 2004, as one part of a Basin-Wide Monitoring Program
developed by the Upper Columbia Regional Technical Team and Upper
Columbia Salmon Recovery Board, the Yakama Nation Fisheries Resource
Management program began monitoring downstream migration of Upper
Columbia River Spring Chinook Salmon and Upper Columbia Steelhead in
Nason Creek, a tributary to the Wenatchee River.

This report summarizes spring chinook salmon and steelhead trout
migration data in Nason Creek during the spring and fall of 2004. We
used counts at the trap and efficiency trials to describe emigration
timing and to estimate population size. Data collection was divided into
spring and fall sessions with a break during the summer months. The
spring trapping period began on March 8^th^ and ended on June 16^th^ and
the fall period began on September 3^rd^ and ended on November 24^th^.

During the spring we collected 336 yearling (2002 brood) spring chinook
salmon, 172 wild steelhead smolts and 283 steelhead parr. A total of 8
mark-recapture trap efficiency trials were performed using hatchery coho
smolts as a surrogate species over a range of stream discharge stages. A
pooled trap efficiency of 3.9% was used to estimate the population size
of both spring chinook and steelhead smolts. We estimate that 9084 (±
410 95%CI) yearling spring chinook and 4955 (± 258 95%CI) steelhead
smolts emigrated past the trap during the spring sample period between
March 8^th^ and June 19^th^ of 2004.

During the fall we collected 1,458 subyearling (2003 brood) spring
chinook salmon and 690 steelhead parr. A total of 7 mark-recapture trap
efficiency trials were conducted, 5 using spring chinook and 2 with
steelhead parr, over a range of stream discharge stages. A pooled trap
efficiency of 20.3% was used to calculate the emigration of spring
chinook and 18.8% was used for steelhead parr during the fall trapping
period from September 3^rd^ through November 24^th^. We estimate that
7899 (± 341 95%CI) subyearling spring chinook and 4071 (± 509 95%CI)
steelhead parr migrated downstream past the trap during the fall sample
period of 2004. If movements of steelhead parr between March 8^th^ and
June 19^th^ are assumed to be fish emigrating from Nason Creek the total
population estimate using the pooled trap efficiency (3.9%) is 7742 (±
339 95%CI).

Table of Contents

[Abstract ii](#abstract)

[List of Tables iii](#__RefHeading___Toc93468681)

[List of Figures iv](#list-of-figures)

[Acknowledgements v](#acknowledgements)

[Introduction 1](#introduction)

[Watershed Description 2](#watershed-description)

[Methods for Estimating Abundance of Juvenile Salmonids
5](#methods-for-estimating-abundance-of-juvenile-salmonids)

[Trapping Equipment and Operation 5](#trapping-equipment-and-operation)

[Data Collection 5](#data-collection)

[Trapping Efficiency and Emigration Estimate
6](#trapping-efficiency-and-emigration-estimate)

[Results 8](#results)

[Trap Operation 8](#trap-operation)

[Daily Emigration 9](#daily-emigration)

[Spring Chinook Fry (2003 Brood) 9](#spring-chinook-fry-2003-brood)

[Spring Chinook Yearlings (2002 Brood) 10](#__RefHeading___Toc93468694)

[Spring Chinook Subyearlings (2003 Brood)
11](#spring-chinook-subyearlings-2003-brood)

[Steelhead/Rainbow Trout Fry and Parr 11](#__RefHeading___Toc93468696)

[Steelhead/Rainbow Trout Smolts 15](#steelheadrainbow-trout-smolts)

[Length and Weight 16](#length-and-weight)

[Spring Chinook Yearlings (2002 Brood) and Subyearlings (2003 Brood)
16](#spring-chinook-yearlings-2002-brood-and-subyearlings-2003-brood)

[Steelhead Fry, Parr, and Smolts 17](#steelhead-fry-parr-and-smolts)

[Trap Efficiency Calibration and Population Estimates
19](#trap-efficiency-calibration-and-population-estimates)

[Mark and Recapture Trials 19](#mark-and-recapture-trials)

[Emigration Estimates 20](#emigration-estimates)

[Spring Chinook Yearling (2002 Brood)
20](#spring-chinook-yearling-2002-brood)

[Subyearling Spring Chinook (2003 Brood)
21](#subyearling-spring-chinook-2003-brood)

[Steelhead Parr and Smolts 22](#steelhead-parr-and-smolts)

[Incidental Species 23](#incidental-species)

[Discussion 24](#discussion)

[Conclusions 25](#__RefHeading___Toc93468709)

[References 26](#references)

[Appendix A 26](#__RefHeading___Toc93468711)

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[]{#__RefHeading___Toc93468681 .anchor}List of Tables

[Table 1. Nason Creek smolt trap operating dates, 2004.
8](#__RefHeading___Toc93468805)

[Table 2. Fork length, weight and condition factor for spring chinook
yearlings and subyearlings collected at the Nason Creek trap during
2004. 16](#__RefHeading___Toc93468806)

[Table 3. Fork length, weight and condition factor for steelhead fry,
parr, and smolts collected at the Nason Creek smolt during 2004.
18](#refheading___toc93468807)

[Table 4. Trap efficiency mark/recapture trials for Nason Creek 2004.
20](#__RefHeading___Toc93468808)

[Table 5. Number and fork length of incidental species collected in
Nason Creek. 23](#__RefHeading___Toc93468809)

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# List of Figures

[Figure 1. Nason Creek smolt trap location.
2](#__RefHeading___Toc93469628)

[Figure 2. Mean daily stream discharge at the Nason Creek DOE stream
monitoring station, RKM 1, from March 1 through December 1, 2004.
4](#__RefHeading___Toc93469629)

[Figure 3. Mean daily water temperature at the Nason Creek DOE stream
monitoring station, RKM 1, from March 1 through December 1, 2004.
4](#__RefHeading___Toc93469630)

[Spring Total 8](#__RefHeading___Toc93469631)

[Fall Total 8](#__RefHeading___Toc93469632)

[Figure 4. Spring chinook fry counts and run-timing at the Nason
Cr**eek**](#__RefHeading___Toc93120414)

[**smolt trap, March 8th through June 19th 2004**
9](#__RefHeading___Toc93120414)

[Figure 5. Yearling spring chinook smolt counts and run-timing at Nason
Creek smolt trap, March 8^th^ through June 19^th^ 2004.
10](#__RefHeading___Toc93469634)

[Figure 6. Spring chinook subyearling counts and run-timing at the Nason
Creek smolt trap, Sept 3^rd^ through Nov 24^th^ 2004.
11](#__RefHeading___Toc93469635)

[Figure 7. Steelhead parr counts and run-timing at the Nason Creek smolt
trap from March 8^th^ through June 19^th^ 2004.
12](#__RefHeading___Toc93469636)

[Figure 8. Steelhead fry counts and run timing at the Nason Creek smolt
trap, Sept 3^rd^ through Nov 24^th^ 2004.
13](#__RefHeading___Toc93469637)

[Figure 9. Steelhead parr (61 mm to 125 mm) counts and run-timing at the
Nason Creek smolt trap, Sept 3^rd^ through Nov 24^th^ 2004.
13](#__RefHeading___Toc93469638)

[Figure 10. Steelhead parr (\> 125 mm) counts and run-timing at the
Nason Creek smolt trap, Sept 3^rd^ through Nov 24^th^ 2004.
14](#__RefHeading___Toc93469639)

[Figure 11. Steelhead smolt counts and run-timing at the Nason
15](#__RefHeading___Toc93120420)

[Figure 12. Stream temperature and the number of subyearling spring
chinook emigrants at Nason Creek trap 2004.
21](#__RefHeading___Toc93469641)

[Figure 13. Stream discharge and the number of subyearling spring
chinook emigrants at Nason Creek trap 2004.
22](#__RefHeading___Toc93469642)

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# Acknowledgements

This project is part of a basin wide monitoring program requiring close
coordination between multiple fisheries management agencies. Thanks to
Thomas Randolf, WDFW, for helping secure the trap during periods of high
stream flow. We would like to thank to Greg Thayer, USFS, for providing
the trapping site at the Nason Creek Campground and accommodating the
needs of this study. The hard work of the Yakama Nation Fisheries
Technicians who operated the trap during al hours including nights and
weekends is appreciated. We would like to thank Chris Jordan the project
sponsor, and Gerald McClintock from the BPA for administering the
funding.

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#  {#section-38 .unnumbered}

#  {#section-39 .unnumbered}

#  {#section-40 .unnumbered}

# Introduction

Beginning in the fall of 2004, as one task within the basin wide
monitoring effort of the Bonneville Power Administration (BPA) project
\# 2003-017-00 Integrated Status & Effectiveness Monitoring Program, the
Yakama Nation, in coordination with the Washington Department of Fish
and Wildlife (WDFW), Washington State Department of Ecology (DOE), the
United States Fish and Wildlife Service (USFWS), the United States
Forest Service (USFS), National Oceanographic and Atmospheric
Administration Fisheries (NOAA Fisheries), the BPA, began extending the
current smolt trapping effort in Nason Creek from three months per year
to nine months per year with the project entitled Expansion of Existing
Smolt Trapping Program in Nason Creek by Yakama Nation Fisheries
Resource Management. The objectives of this project are:

1\) Estimate the smolt production of spring chinook salmon and steelhead
for the Nason Creek watershed within the Wenatchee Subbasin.

2\) Describe the temporal variability of outmigrating spring Chinook and
steelhead within Nason Creek.

The data generated from this project will estimate natural spring
chinook and steelhead production and productivity allowing researchers
to calculate annual population estimates, egg-to-emigrant survival, and
emigrant-to-adult survival rates and include colleting data and
providing population estimates for ESA listed spring chinook salmon and
steelhead trout. Population estimates will be used to evaluate the
effects of supplementation programs in the Wenatchee River Basin as well
as to begin to collect data in Nason Creek to develop a spawner-recruit
relationship.

This report summarizes data collection from the Nason Creek smolt trap
during the 2004 trapping periods of March 8^th^ through June 19^th^, and
from September 3^rd^ through November 24^th^. The target species in the
spring was coho salmon, hatchery and naturally produced, as part of the
Mid-Columbia Coho Reintroduction project (project #1994-040-000). We
targeted fall subyearling chinook and steelhead migrants during the fall
under a pilot project to initiate a basin wide monitoring program
(project #2003-017-000). During the summer, June 20^th^ through
September 2^nd^, due to the section 10 permitting process, we did not
operate the smolt trap.

Juvenile chinook salmon captured in Nason Creek during 2004 represent
two broodyears, 2002 and 2003. While we have previously operated the
trap in the spring (2001 & 2003), 2004 was the first year that we
operated the trap during the fall. A complete broodyear of emigrants
will not be available for analysis until next year.

## 

## Watershed Description

The Nason Creek watershed drains 65,600 acres of alpine glaciated
landscape where high precipitation and moderate rain on snow recurrence
control the hydrology and aquatic communities (USFS et al. 1996). Nason
Creek originates near the Cascade Crest at Stevens Pass and flows
approximately 37 river kilometers until joining the Wenatchee River at
Rk 86.3 just below Lake Wenatchee. The smolt trap is located below the
majority of spring chinook and steelhead spawning grounds at Rk 0.8
(Figure 1). There are 26.4 Rk accessible to salmon. Private land
ownership comprises 52,300 acres (79.7%) of the watershed while 12,800
acres (19.5%) are federal and 480 acres (0.1%) are state owned (USFS et
al. 1996).

![](media/image2.wmf){width="5.988888888888889in"
height="4.627777777777778in"}

Figure 1. Nason Creek smolt trap location.

The channel morphology of the lower 25 kilometers of Nason Creek has
been impacted by development of highways, railroads power lines, and
houses resulting in channel confinement and reduced side channel
habitat. The present condition is a low gradient (\<= 1.1%), low
sinuosity (1.2 to 2.0 channel length to valley length ratio), and mainly
depositional channel (USFS et al. 1996).

The Washington State Department of Ecology (DOE) began operating a
stream monitoring station near the mouth of Nason Creek in May of 2002.
The mean daily discharge for the 2004 water year (October 1, 2003
through September 31, 2004) was 338 cfs. Peak runoff typically occurs in
May and June with occasional high water rain on snow events in October
and November. The hydrograph observed during the 2004 smolt trapping
period followed the typical discharge regime (Figure 2). Daily mean
stream discharge measurements taken by the Washington State DOE during
the 2004 and 2005 water years are in Appendix A.

The Nason Creek water temperature recorded at the DOE station during the
2004 smolt trapping period ranged from 3.7 °C on March 9^th^ to 4.6 °C
on November 24^th^. The peak temperature of 19.5 °C was reached on
August 16^th^ and the minimum water temperature was 2.1 °C on November
21^st^ (Figure 3). The temperature regime during the 2004 smolt trapping
period was similar to that of the previous 3 years of record. Daily mean
stream temperature measurements taken by the Washington State DOE during
the 2004 and 2005 water years are in Appendix A.

Fish present in Nason Creek are chinook salmon [*Oncorhynchus
tshawytscha*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=tshawytscha),
steelhead trout and rainbow trout [*Oncorhynchus
mykiss*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=mykiss),
coho salmon [*Oncorhynchus
kisutch*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=kisutch),
cutthroat trout [*Oncorhynchus clarki
clarki*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=clarki clarki),
bull trout [*Salvelinus
confluentus*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Salvelinus&speciesname=confluentus),
mountain whitefish [*Prosopium
williamsoni*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Prosopium&speciesname=williamsoni),
redside shiner [*Richardsonius
balteatus*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Richardsonius&speciesname=balteatus),
sucker *Catostomus sp*, sculpin *Cottus sp*, dace *Rhinichthys sp* and
northern pikeminnow*.* Hatchery activity in Nason Creek includes the BPA
funded coho reintroduction program, the Chelan County PUD funded
hatchery steelhead direct plants, and the Grant County PUD funded spring
chinook captive brood program (2004 marks the first captive brood
release in Nason Creek).

![](media/image3.wmf){width="5.86875in" height="3.4930555555555554in"}

[]{#__RefHeading___Toc93469629 .anchor}Figure 2. Mean daily stream
discharge at the Nason Creek DOE stream monitoring station, RKM 1, from
March 1 through December 1, 2004.

![](media/image4.wmf){width="5.874305555555556in" height="3.625in"}

Figure 3. Mean daily water temperature at the Nason Creek DOE stream
monitoring station, RKM 1, from March 1 through December 1, 2004.

# Methods for Estimating Abundance of Juvenile Salmonids

## Trapping Equipment and Operation

A floating rotary screw trap with a 5-foot diameter cone, manufactured
by EG Solutions of Eugene, OR, was used to capture fish moving
downstream. The trap retains live fish in a holding box until they are
removed. A rotating drum screen constantly removes small debris from the
live box. The trap was hung, with wire rope, from a snatch block
connected to a stream spanning cable. We positioned the trap in the
thalweg; trap position could be adjusted with a 'come-along' type
puller.

## Data Collection

The protocol for trap operating procedures and techniques followed the
standardized basin-wide monitoring plan developed by the Upper Columbia
Regional Technical Team for the Upper Columbia Salmon Recovery Board
(Hillman 2004), adapted from Murdoch et al. (2000).

We used water filled sactuary nets to transfer fish from the holding box
to 5 gallon plastic buckets. All fish were enumerated by species and
size class. Fish to be sampled were anesthetized in a solution of
MS-222, weighed with a portable electronic scale, and measured in a
trough type measuring board. Anesthetized fish were allowed to fully
recover before being released downstream from the trap.

Length and weight measurements were recorded for all fish except on days
when large numbers were collected, and then 25 of each size class of the
target species were measured and weighed. Fork length was recorded to
the nearest millimeter and weight to the nearest 0.1 gram. We used this
data to calculate a Fulton-type condition factor (Kfactor), following
methods described in the protocol, for all spring chinook and wild
steelhead sampled using the formula:

> K = (W/L^3^) x 100,000

Where K = Fulton-type condition metric, W = weight in grams, L = length
in millimeters and 100,000 is a scaling constant.

## 

Juvenile spring chinook trapped in 2004 represented two brood years and
were classified by size and the time of year the fish were collected.
Chinook subyearlings (BY 2003; age 0+) recorded as fry (≤ 60 mm) were
captured between March and June. Chinook subyearlings classified as parr
or pre-smolts (\> 60 mm) were captured emigrating between September and
November. Chinook yearlings (BY2002), emigrating in the spring, were
identified as smolts (\>60mm). Steelhead were classified by size class:
fry (≤ 60 mm), parr (61-90 mm), parr/smolt (91-125 mm), and parr/smolt
(\> 125 mm), and degree of smoltification (parr, transitional, smolt).

## Trapping Efficiency and Emigration Estimate

Standard mark and recapture efficiency trials were conducted throughout
the trapping period following the protocols and calculations described
in Hillman (2004). The protocols required a minimum of 100 fish in each
mark-recapture trial. When insufficient numbers of emigrating chinook or
steelhead were captured, we held the fish up to three days, in live
boxes, to increase the number available for the trial. If after 3 days
of collection, numbers were still insufficient for an efficiency trial,
the fish were released in calm water downstream from the trap. Fish used
in efficiency trials were marked with either an upper or lower caudal
fin clip and held for at least 8 hours of recovery before being
transported in 5-gallon buckets 1.4 km upstream to the release site. We
released the fish in the evening, and distributed them across the creek
when stream flows allowed for wading. Only fish recaptured within the
first 48 hours after release were used in the trap efficiency
calculations. Trap efficiency was calculated with the following formula:

Trap efficiency = ![](media/image5.wmf){width="0.8194444444444444in"
height="0.2222222222222222in"}

Where *E~i~* is the trap efficiency during time period *i*; *M~i~* is
the number of marked fish released during time period *i*; and *R~i~* is
the number of marked fish recaptured during time period *i*. The
frequency that trap efficiency trials were conducted was limited by the
number of fish collected. The daily emigration estimate was calculated
by expanding the catch at the trap by trap efficiency using the
following formula:

Estimated daily migration =
![](media/image6.wmf){width="0.7777777777777778in"
height="0.3611111111111111in"}

Where *N~i~* is the estimated number of fish passing the trap during
time period *i*; *C~i~* is the number of unmarked fish captured during
time period *i;* and *e~i~* is the estimated trap efficiency for time
period *i*. A linear regression was used to correlate trap efficiency
(from efficiency trials) with discharge (cfs). If a relationship was
found (p\<0.05; r^s^ \>0.50) the regression equation was used to
estimate daily trap efficiency.

The variance for the total daily number of fish traveling downstream
past the trap was calculated form the following formulas:

Variance of daily migration estimate =
![](media/image7.wmf){width="2.69375in" height="0.9166666666666666in"}

Where *X~i~* is the discharge for time period *i*, and *n* is the sample
size. If a relationship between discharge and trap efficiency was not
present (i.e., *P* \< 0.05; *r*^2^  0.5), a pooled trap efficiency was
used to estimate daily emigration:

Pooled trap efficiency =
![](media/image8.wmf){width="1.1805555555555556in"
height="0.2638888888888889in"}

The variance for daily emigration estimates using the pooled trap
efficiency was calculated using the formula:

Variance for daily emigration estimate = ![](media/image9.wmf)

The total emigration estimate and confidence interval were calculated
using the following formulas:

Total emigration estimate =
![](media/image10.wmf){width="0.4166666666666667in"
height="0.2638888888888889in"}

95% confidence interval =
![](media/image11.wmf){width="1.2638888888888888in"
height="0.3055555555555556in"}

The following assumptions must be made for the population estimated to
be valid (Murdoch et al. 2001):

1\) All marked fish passed the trap or were recaptures during time
period *i*.

2\) The probability of capturing a marked or unmarked fish is equal.

3\) All marked fish recaptured were identified.

# 

## 

# 

# Results

## Trap Operation

We deployed the trap in Nason Creek on March 5^th^ and began operating
on March 8^th^. We fished the trap continuously until June 16^th^,
except during periods of high runoff or large hatchery smolt releases
upstream of the trap (Table 1). We did not operate the trap during the
summer until the section 10 permitting process was complete. The
permitting process led to a September 3^rd^ trap installation date. Low
water conditions delayed continuous trap operation until September
14^th^. During the fall, we operated the trap between September 14^th^
and November 24th when high water and cold temperatures prohibited
operation.

[]{#__RefHeading___Toc93468805 .anchor}Table 1. Nason Creek smolt trap
operating dates, 2004.

+--------------+------------+----------------+---------+------+-----+
| **Period**   | **Trap     | *              | **Days  | **   |     |
|              | Status**   | *Description** | Oper    | Days |     |
|              |            |                | ating** | Miss |     |
|              |            |                |         | ed** |     |
|              |            |                |         |      |     |
|              |            |                |         | *    |     |
|              |            |                |         | * ** |     |
+--------------+------------+----------------+---------+------+-----+
| 8 Mar - 19   | Operating  | Continuous     | 43      | 0    |     |
| Apr          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 20 Apr - 23  | Not        | Steelhead      | 0       | 3    |     |
| Apr          | Operating  | Release        |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 24 Apr - 28  | Operating  | Continuous     | 35      | 0    |     |
| May          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 29 May - 31  | Not        | High           | 0       | 3    |     |
| May          | Operating  | Flow/Debris    |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 1 Jun - 19   | Operating  | Continuous     | 19      | 0    |     |
| Jun          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
|              |            |                | **97    | **6  | Spr |
|              |            |                | (94%)** | (6   | ing |
|              |            |                |         | %)** | To  |
|              |            |                |         |      | tal |
+--------------+------------+----------------+---------+------+-----+
| 20 Jun - 2   | Not        | Lack of Permit | 0       | 83   |     |
| Sep          | Operating  |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 3 Sep        | Operating  | Continuous     | 1       | 0    |     |
+--------------+------------+----------------+---------+------+-----+
| 4 Sep - 13   | Not        | Low Stream     | 0       | 10   |     |
| Sep          | Operating  | Flow           |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 14 Sep - 25  | Operating  | Continuous     | 43      | 0    |     |
| Oct          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 26-Oct       | Not        | Trap           | 0       | 1    |     |
|              | Operating  | Maintenance    |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 27 Oct - 2   | Operating  | Continuous     | 7       | 0    |     |
| Nov          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 3 Nov        | Not        | High           | 0       | 1    |     |
|              | Operating  | Flow/Debris    |         |      |     |
+--------------+------------+----------------+---------+------+-----+
| 4 Nov - 24   | Operating  | Continuous     | 21      | 0    |     |
| Nov          |            |                |         |      |     |
+--------------+------------+----------------+---------+------+-----+
|              |            |                | **72    | **12 | F   |
|              |            |                | (86%)** | (14  | all |
|              |            |                |         | %)** | To  |
|              |            |                |         |      | tal |
+--------------+------------+----------------+---------+------+-----+

## 

## 

## 

## 

## Daily Emigration

### [Spring Chinook Fry (2003 Brood)]{.underline}

Between March 8^th^ and June 19^th^, 90 newly emerged spring chinook fry
were collected. Chinook fry were easily identified by size. The first
BY2003 fry were captured on the first day of trapping. The majority of
the chinook fry (84%) were collected before May 1^st^ (Figure 4). High
water events accounted for two chinook fry mortalities, likely caused by
debris in the live box.

![](media/image12.wmf){width="5.995833333333334in"
height="3.7263888888888888in"}

[]{#__RefHeading___Toc93120414 .anchor}Figure 4. Spring chinook fry
counts and run-timing at the Nason Creek smolt trap, March 8^th^ through
June 19^th^ 2004.

###  

[]{#__RefHeading___Toc93468694 .anchor}[Spring Chinook Yearlings (2002
Brood)]{.underline}

We collected 336 yearling spring chinook smolts (BY2002) during the
spring. The first smolt was trapped on March 8^th^, the first day of
operation. Peak emigration (38.4% of the run) occurred between April
6^th^ and April 13^th^ with a daily peak of 33 yearlings (9.8%) on April
8^th^ (Figure 5). During spring high water events four chinook yearling
mortalities occurred, likely due to debris in the live box. In addition
to the naturally produced yearling spring chinook smolts, 110 hatchery
captive brood smolts were trapped.

![](media/image13.wmf){width="5.614583333333333in"
height="3.6354166666666665in"}

Figure 5. Yearling spring chinook smolt counts and run-timing at Nason
Creek smolt trap, March 8^th^ through June 19^th^ 2004.

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### [Spring Chinook Subyearlings (2003 Brood)]{.underline}

We collected 1,458 subyearling spring chinook during the fall. We began
trapping the 2003 brood emigrants on Sept 3rd, the first day of
operation. Peak emigration (42.9%) occurred between November 4^th^ and
November 9^th^ with a daily peak of 190 subyearlings (13.0%) on November
4^th^ (Figure 6). Most of the subyearlings, 69.5%, emigrated in
November. Four chinook subyearling mortalities occurred, likely due to
debris in the live box. One precocial spring chinook was captured.

![](media/image14.wmf){width="5.5625in" height="3.2395833333333335in"}

Figure 6. Spring chinook subyearling counts and run-timing at the Nason
Creek smolt trap, Sept 3^rd^ through Nov 24^th^ 2004.

### 

[]{#__RefHeading___Toc93468696 .anchor}[Steelhead/Rainbow Trout Fry and
Parr]{.underline}

Between March 8^th^ and June 19^th^ we captured 457 wild steelhead of
various age classes and smoltification stages. One fry was collected
during the spring, on June 1^st^. A total of 283 parr emigrants were
caught during April through June. Peak daily emigration occurred on
April 28^th^ when 26 parr (9.2%) were captured. The 5-days following
this peak accounted for 20.8% of the total spring parr emigration
(Figure 7). Steelhead parr mortality was 13 fish of which 8 were due to
high water and debris in the trap.

![](media/image15.wmf){width="5.854166666666667in" height="3.59375in"}

Figure 7. Steelhead parr counts and run-timing at the Nason Creek smolt
trap from March 8^th^ through June 19^th^ 2004.

Between September 3^rd^ and November 24^th^, 791 naturally produced
steelhead were collected; 101 fry or sub-parr (≤ 60 mm); 572 steelhead
parr (60 mm to 125 mm); and 118 steelhead parr (\> 125 mm). The majority
(89%) of steelhead fry were caught in September and a peak daily
collection of 21 fry occurred on September 16^th^ (Figure 8). Steelhead
parr in the 61 mm to 125 mm size class totaled 572 fish with the
majority (53%) captured in September. The peak daily emigration of this
group occurred on September 15^th^ when 101 fish were collected (Figure
9). Of the 118 steelhead parr \> 125 mm, 53.4% were collected in
November and the peak daily capture was 28 on November 4^th^ (Figure
10). During this period 7 steelhead fry mortalities and 1 parr mortality
occurred.

![](media/image16.wmf){width="6.0in" height="3.6041666666666665in"}

Figure 8. Steelhead fry counts and run timing at the Nason Creek smolt
trap, Sept 3^rd^ through Nov 24^th^ 2004.

![](media/image17.wmf){width="5.999305555555556in"
height="3.8444444444444446in"}

Figure 9. Steelhead parr (61 mm to 125 mm) counts and run-timing at the
Nason Creek smolt trap, Sept 3^rd^ through Nov 24^th^ 2004.

![](media/image18.wmf){width="5.9375in" height="3.4583333333333335in"}

[]{#__RefHeading___Toc93469639 .anchor}Figure 10. Steelhead parr (\> 125
mm) counts and run-timing at the Nason Creek smolt trap, Sept 3^rd^
through Nov 24^th^ 2004.

### 

### 

### 

### 

### 

### 

### 

### 

### 

### 

### 

### 

### [Steelhead/Rainbow Trout Smolts]{.underline}

A total of 172 smolting steelhead were trapped during the spring with
the first steelhead smolt on captured on March 10^th^ (Figure 11).
During March, all of the smolts were in the transitional stage. In April
the ratio was 45% transitional and 55% smolt and by May it was 23.5%
transitional and 76.5% smolted steelhead. Overall 67 fish (39%) were in
the transitional stage and 105 (61%) were smolts. The peak smolt
emigration was seen during the week of April 27^th^ through May 3^rd^
when 30.8% of the smolts were collected. In addition to the naturally
produced steelhead smolts, 979 hatchery steelhead smolts were captured
from April 9^th^ through June 11^th^.

. ![](media/image19.wmf){width="5.927083333333333in"
height="4.302083333333333in"}

[]{#__RefHeading___Toc93120420 .anchor}Figure 11. Steelhead smolt counts
and run-timing at the Nason Creek smolt trap, March 8^th^ through June
19^th^ 2004.

## Length and Weight

### [Spring Chinook Yearlings (2002 Brood) and Subyearlings (2003 Brood)]{.underline}

BY2003 spring chinook fry were trapped from March through June, 2004.
Fork length (FL) of the fry increased during the summer months,
continuing into the fall. Mean fry Kfactor increased steadily through
the spring from 0.83 in March to 1.08 in June (Table 2).

BY2002 chinook yearlings were collected as soon as trapping began in
March. Fall data is not available for BY2002 so we are unable to measure
over-winter growth. Between March and May the mean FL of yearling
emigrants increased 5.2 mm. Similarly, the mean Kfactor increased during
the spring (1.01 in March; 1.11 in June) (Table 2).

[]{#__RefHeading___Toc93468806 .anchor}Table 2. Fork length, weight and
condition factor for spring chinook yearlings and subyearlings collected
at the Nason Creek trap during 2004.

  --------------- ---------- -------- --------- ---------- -------- --------- ------------- -------- ---------
  ** **           **Fork                        **Weight                      **Kfactor**            
                  Length                        (g)**                                                
                  (mm)**                                                                             

  **Date**        **Mean**   **SD**   ***N***   **Mean**   **SD**   ***N***   **Mean**      **SD**   ***N***

  **Spring                                                                                           
  Chinook                                                                                            
  Subyearling                                                                                        
  Emigrants**                                                                                        

  Mar-04          37.8       2.5      36        0.4        0.2      33        0.83          0.33     33

  Apr-04          37.5       1.4      40        0.5        0.1      40        0.88          0.16     40

  May-04          44.3       9.3      6         1.1        0.4      4         0.90          0.12     4

  Jun-04          49.6       5.2      9         1.3        0.4      9         1.08          0.26     9

  Sep-04          75.2       8.2      108       4.3        1.6      74        1.00          0.17     74

  Oct-04          82.7       6.8      239       5.9        1.6      188       1.04          0.11     188

  Nov-04          83.4       6.4      421       6.2        1.6      420       1.05          0.13     419

  **Spring                                                                                           
  Chinook                                                                                            
  Yearling                                                                                           
  Emigrants**                                                                                        

  Mar-04          89.3       7.0      101       7          1.8      101       1.01          0.07     101

  Apr-04          92.9       8.6      195       7.6        2.2      195       1.05          0.09     195

  May-04          94.5       8.9      28        8.9        3.6      26        1.07          0.12     26

  Jun-04          118                 1         18.3                1         1.11                   1

  **Precocial**                                                                                      

  Sep-04          163                 1         46                  1         1.06                   1
  --------------- ---------- -------- --------- ---------- -------- --------- ------------- -------- ---------

### 

### [Steelhead Fry, Parr, and Smolts]{.underline}

Steelhead fry that emerged in late spring and summer were trapped in
September with a mean FL of 55 mm and Kfactor of 1.01. During October
and November very few steelhead fry \< 60 mm were collected (Table 3).

Steelhead parr measuring between 61 mm to 89 mm were trapped throughout
both the spring and fall. The mean FL for this group was 71 mm in March
and increasing to 85 mm by June. Similarly, the mean condition factor
increased from 0.98 in March to 1.10 in June. The mean FL for steelhead
parr (61mm to 89mm) increased from 68 mm in September to 74 mm in
November. The Kfactor decreased from June (1.10) to September (1.03).
Between September and November the Kfactor for steelhead parr (61mm to
89 mm) remained the same (Table 3).

Steelhead parr measuring 90 mm to 120 mm were also trapped throughout
the entire trapping season with a definite peak emigration in June. Mean
FL and Kfactor of the steelhead did not increase the spring but was
slightly larger in the fall. Some of the steelhead at the upper end of
this size class were showing signs of smoltification in the spring
(Table 3).

Steelhead in the transitional stages of smoltification began appearing
at the trap during March and continued through June of 2004 with an
obvious peak emigration in May. These fish were mostly FL \>120 mm with
a mean fork length of 134 mm in March and increasing to 175 mm in June.
The condition factor of smolts was generally less than 1.0 with a mean
of 0.93 in March. Not all steelhead over 120 mm showed signs of
smoltification. Many fish in this size group (FL \>120mm) were collected
during the fall with a mean FL of 148 mm in September (Table 3).

[]{#refheading___toc93468807 .anchor}Table 3. Fork length, weight and
condition factor for steelhead fry, parr, and smolts collected at the
Nason Creek smolt during 2004.

  ------------- ---------- -------- --------- ---------- -------- --------- ------------- -------- ---------
  ** **         **Fork                        **Weight                      **Kfactor**            
                Length                        (g)**                                                
                (mm)**                                                                             

  **Date**      **Mean**   **SD**   ***N***   **Mean**   **SD**   ***N***   **Mean**      **SD**   ***N***

  **Steelhead                                                                                      
  Fry (≤ 60                                                                                        
  mm)**                                                                                            

  Sep-04        55         4        90        1.7        0.5      46        1.01          0.23     46

  Oct-04        59         1        3         2.0        0.1      2         1.00          0.03     2

  Nov-04        56         5        8         2.0        0.5      8         1.15          0.11     8

  **Steelhead                                                                                      
  Parr (61 to                                                                                      
  89 mm)**                                                                                         

  Mar-04        71         7        8         3.5        1.2      8         0.98          0.08     8

  Apr-04        77         8        61        5.0        1.6      61        1.07          0.12     61

  May-04        79         7        46        6.2        4.2      46        1.36          1.63     46

  Jun-04        85         5        23        6.7        1.5      20        1.10          0.14     20

  Sep-04        68         6        90        3.2        1.0      63        1.03          0.28     63

  Oct-04        71         6        35        3.6        1.2      28        1.00          0.30     28

  Nov-04        74         7        130       4.4        1.3      130       1.05          0.15     130

  **Steelhead                                                                                      
  Parr/Smolt                                                                                       
  (90 to 120                                                                                       
  mm)**                                                                                            

  Mar-04        106        2        3         12.0       0.5      3         1.01          0.08     3

  Apr-04        104        9        22        12.2       3.5      22        1.06          0.10     22

  May-04        101        8        33        11.0       3.1      33        1.04          0.19     33

  Jun-04        101        8        87        10.8       3.6      86        1.02          0.25     86

  Sep-04        110        8        10        12.7       3.9      4         0.87          0.34     4

  Oct-04        107        12       2         12.9       6.1      2         1.02          0.15     2

  Nov-04        107        9        16        12.8       3.4      16        1.02          0.06     16

  **Steelhead                                                                                      
  Parr/Smolt                                                                                       
  (\>120 mm)**                                                                                     

  Mar-04        134        5        5         22.7       4.6      5         0.93          0.11     5

  Apr-04        165        28       71        48.9       24.4     71        1.02          0.09     71

  May-04        175        23       82        53.4       19.7     82        0.96          0.18     82

  Jun-04        148        30       9         29.3       16.9     9         0.94          0.32     9

  Sep-04        148        21       48        36.2       16.4     25        1.00          0.14     25

  Oct-04        145        26       11        32.1       24.1     11        0.94          0.06     11

  Nov-04        147        18       42        33.0       13.7     40        1.00          0.07     40
  ------------- ---------- -------- --------- ---------- -------- --------- ------------- -------- ---------

# Trap Efficiency Calibration and Population Estimates

## Mark and Recapture Trials

Standard mark/recapture efficiency trials were conducted over a range of
stream discharge stages on Nason Creek throughout the duration of
trapping. Since 2004 was the first year we operated the trap with the
objective of calculating population estimates for spring chinook and
steelhead, an appropriate release location needed to be established.
Finding a suitable release location required using the September mark
groups to test multiple sites; to determine the maximum upstream
distance where fish could be released and still be collected within 24
hours.

Hatchery coho smolts were the target species during the spring of 2004.
We were not permitted to mark spring chinook or steelhead. We conducted
8 mark-recapture trials with hatchery coho smolts. Trap efficiencies
ranged between 2.2% and 5.5%, the pooled trap efficiency was 3.9% (Table
4). Efficiency estimates for hatchery coho smolts may not apply to
naturally produced chinook and steelhead.

During the fall, spring chinook and steelhead were rarely available in
sufficient numbers to collect the 100 fish per mark group as described
in the trapping protocol (Hillman 2004). We conducted efficiency trials
with as many fish of one species as could be obtained without holding
for more than 3 days. We were able to conduct a total of 5 efficiency
trials between September and November. The trap efficiency ranged
between 9.7% and 32% with a pooled efficiency for spring chinook of 20.3
% Steelhead parr were marked and recaptured during two trials in the
fall season but did not amount to the desired sample size of 100 fish
(Table 4). Efficiency testing was not done on fry of any species.

[]{#__RefHeading___Toc93468808 .anchor}Table 4. Trap efficiency
mark/recapture trials for Nason Creek 2004.

  ---------------- -------------- -------------- -------------- --------------
  **Date           **Number       **Total        **Percent      **Average
  Released**       Marked**       Recaptured**   Recaptured**   Daily CFS**

  **Spring Chinook                                              
  Subyearlings**                                                

  19-Oct-04        31             3              9.7            145

  27-Oct-04        72             14             19.4           132

  4-Nov-04         182            45             24.7           308

  11-Nov-04        25             8              32.0           254

  18-Nov-04        45             2              4.4            183

  Total (mean)     355            72             (20.3)         \(204\)

  **Wild Steelhead                                              
  Parr**                                                        

  19-Oct-04        20             1              5.0            147

  4-Nov-04         49             12             24.5           308

  Total (mean)     69             13             (18.8)         \(228\)

  **Hatchery Coho                                               
  Smolts**                                                      

  8-Apr            76             3              3.9            821

  28-Apr           200            7              3.5            826

  5-May            172            7              4.1            1040

  7-May            226            5              2.2            1140

  10-May           194            9              4.6            674

  13-May           108            3              2.8            609

  18-May           163            9              5.5            1130

  20-May           203            9              4.4            1000

  Total (mean)     1342           52             (3.9)          \(905\)
  ---------------- -------------- -------------- -------------- --------------

## Emigration Estimates

### [Spring Chinook Yearling (2002 Brood)]{.underline}

We did not find a significant relationship (*p*=0.64, *r*^2^=0.039)
between trap efficiency and stream discharge during the spring. A pooled
efficiency of 3.9% was used for to generate the daily emigration
estimate of yearling spring chinook between March 8^th^ and June 16^th^.
During the spring there were 7 days out of 103 when we did not operate
the trap. Daily catch for days when the trap was inoperable was
estimated by averaging the 2 previous and 2 following days. We estimate
that 9084 (± 410 95%CI) yearling spring chinook emigrated from Nason
Creek from March 8^th^ through June 19^th^.

Spring chinook fry were not included in the population estimate nor were
they used in any of the marked groups released for efficiency trials.
Although fry were collected during the spring it is likely that they
were displaced during high flow events or emerging from redds upstream
in the vicinity of the trap and not actively emigrating from Nason
Creek.

### [Subyearling Spring Chinook (2003 Brood)]{.underline}

The results of the linear regression of subyearling spring chinook trap
efficiencies and stream discharge indicated that the relationship was
not significant (*p*=0.26, *r*^2^=0.39). A pooled trap efficiency of
20.3% was used to generate the daily emigration estimate.

Due to high water conditions an debris we did not operate the trap 12
days out of 83 during the fall. The daily catch was estimated for the
missing days by averaging the catch from the 2 previous and 2 following
days. We estimate that 7899 (± 341 95%CI) subyearling spring chinook
emigrated from Nason Creek between September 3^rd^ and November 24^th^.
The population estimate is conservative because subyearlings were likely
moving downstream before we began operating the trap in September and
the after the trap was removed due to weather conditions in November.
The fall migration of subyearling chinook appeared to be initiated by a
decline in water temperature and an increase in stream discharge (Figure
12 and 13).

![](media/image20.wmf){width="5.998611111111111in"
height="4.227083333333334in"}

[]{#__RefHeading___Toc93469641 .anchor}Figure 12. Stream temperature and
the number of subyearling spring chinook emigrants at Nason Creek trap
2004.

![](media/image21.wmf){width="5.997222222222222in"
height="4.257638888888889in"}

[]{#__RefHeading___Toc93469642 .anchor}Figure 13. Stream discharge and
the number of subyearling spring chinook emigrants at Nason Creek trap
2004.

### [Steelhead Parr and Smolts]{.underline}

Due to limitations of our trapping permit, only coho salmon could be
used in efficiency trials during the spring. Using the pooled trap
efficiency of 3.9% we estimate that 4955 (± 258 95%CI) steelhead smolts
emigrated from Nason Creek between March 8^th^ and June 19^th^.

.

We collected steelhead parr throughout the entire trapping period,
spring and fall. We are unsure as to whether the parr were actively
emigrating from Nason Creek, displaced during high water, or influenced
by other environmental variables. Assuming the steelhead parr were
emigrating, we estimate that 7742 (± 339 95%CI) passed the trap during
spring operation between March 8^th^ and June 19^th^.

During the fall, due to limited numbers of steelhead parr, we were only
able to conduct two mark-recapture trials. We used a pooled trap
efficiency, based on the two trials, of 18.8% to estimate the daily
emigration. We estimate that 4071 (± 509 95%CI) steelhead parr emigrated
from Nason Creek between September 3^rd^ and November 24^th^.

## Incidental Species

All of the fish species known to Nason Creek, except cutthroat trout,
were represented in the trap catch: chinook salmon [*Oncorhynchus
tshawytscha*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=tshawytscha),
steelhead trout and rainbow trout [*Oncorhynchus
mykiss*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=mykiss),
coho salmon [*Oncorhynchus
kisutch*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Oncorhynchus&speciesname=kisutch),
mountain whitefish [*Prosopium
williamsoni*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Prosopium&speciesname=williamsoni),
redside shiner [*Richardsonius
balteatus*](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Richardsonius&speciesname=balteatus),
sucker *Catostomus sp*, sculpin *Cottus sp*, and dace *Rhinichthys sp*,.
Additionally, four juvenile northern pikeminnow *[Ptychocheilus
oregonensis](http://www.fishbase.org/Summary/SpeciesSummary.cfm?genusname=Ptychocheilus&speciesname=oregonensis)*
were captured in the fall. Hatchery chinook, steelhead, and coho were
also caught. Incidental species were enumerated and sampled for length
and weight as time allowed (Table 5).

[]{#__RefHeading___Toc93468809 .anchor}Table 5. Number and fork length
of incidental species collected in Nason Creek.

  -------------------- ---------------- ----------- ------------ ---------
  **Species**          **Total          **Fork                   
                       Captured**       Length                   
                                        (mm)**                   

                                        **Mean**    **SD**       ***N***

  Bull trout           10               142         43.4         6

  Hatchery Chinook     110              157         71.2         92

  Hatchery Coho        6390             127         22.5         67

  Dace                 106              42          23           8

  Redside Shiner       2                n/a         n/a          n/a

  Sculpin              16               66          40.9         5

  Hatchery Steelhead   979              187         30.3         89

  Sucker               65               104         47.8         26

  Northern pikeminnow  4                n/a         n/a          n/a

  Whitefish            52               117         68.6         12
  -------------------- ---------------- ----------- ------------ ---------

# Discussion

This was the first year we operated the Nason Creek smolt trap for the
purpose of generating population estimates for juvenile spring chinook
and steelhead in Nason Creek. Data collection in the spring was focused
on hatchery coho.

The juvenile freshwater life history of chinook resulted in the
emigration of two brood years, yearling smolts in the spring and
subyearling parr in the fall. A population estimate for a complete brood
year (BY2003) will not be available until after the spring 2005 season.

Steelhead emigrate at different life stages, some as smolts in the
spring and others as parr throughout the year. With multiple age classes
of steelhead emigrating as both parr and smolt, scale sample analysis is
necessary to calculate brood year population estimates. Scale sampling
of steelhead smolts will begin in spring 2005.

In 2005 we will continue to conduct mark-recapture trials with both
chinook and steelhead. As more data is collected, we should be able to
develop a model to correlate trap efficiency with stream discharge,
resulting in a more accurate population estimate. Data from 2004 could
be re-evaluated when efficiency curves for both steelhead and chinook
are developed.

The emigrant population estimates, combined with ongoing egg deposition
surveys, will allow fisheries managers to estimate egg to emigrant
survival rates and emigrant-to-adult survival of Nason Creek spring
chinook and steelhead. These population estimates are important tools to
evaluate the effects of supplementation programs and long-term
population trends in the Wenatchee River Basin.

Preliminary conclusions can be made from this year's data regarding
emigration timing of spring chinook and steelhead within Nason Creek.
There appear to be two distinct emigrations of spring chinook, a spring
group of yearlings which overwintered and a subyearling group of
migrants in the fall. This pattern is also seen in the Chiwawa River,
another major tributary to the Wenatchee with a monitored spring chinook
population (Murdoch et. al. 2001). It is unknown what proportion of
Nason Creek chinook emigrate as subyearlings vs yearlings. In the
Chiwawa River the ratio of yearlings to subyearlings varies each year.
In 1993, Chiwawa River trapping data produced a total emigration
estimate of 8,662 (37.6%) yearlings and 14,036 (61.0%) subyearlings. The
following year the ratio was reversed with 16,472 (65.4%) yearlings and
8,595 (34.1%) subsyearlings (Murdoch et al. 2001). Factors which may
influence whether a fish migrates as a subyearling or yearling may be a
function of juvenile rearing densities, genetics, or environmental
conditions.

# Conclusions

This was the first year using a screw trap to estimate the production of
juvenile spring chinook and steelhead in Nason Creek as part of an
ongoing basin wide monitoring project.

-   In 2004 the trap was operated from March 8^th^ through June 19^th^
    with coho as the target species. Trapping operations were postponed
    during the summer due to lack of Section 10 permitting. Trapping
    resumed on September 3^rd^ and continued through November 24^th^
    with spring chinook and steelhead as the target species.

-   During spring trapping, 336 yearling (2002 brood) spring chinook
    were captured.

-   During spring trapping, 1 steelhead fry, 172 steelhead smolts and
    283 steelhead parr were captured.

-   Trap efficiency during the spring averaged 3.9% from 8 trials with
    hatchery coho smolts.

-   During fall trapping, 1,458 subyearling (2003 brood) spring chinook
    were captured.

-   During fall trapping, 101 steelhead fry and 690 steelhead parr were
    captured.

-   Trap efficiency during the spring averaged 20.3% for spring chinook
    and 18.8% for steelhead parr.

-   There are two distinct emigrations of juvenile spring chinook in
    Nason Creek; subyearling parr emigrating in the fall and yearling
    smolts leaving the following spring.

-   Nason Creek steelhead emigrate at different life stages, some as
    smolts in the spring and others as parr throughout the year.

# 

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# 

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# 

# 

# 

# 

# References

Hillman, T.W. 2004. Monitoring strategy for the Upper Columbia Basin:
Draft report February 1, 2004. Prepared for Upper Columbia Regional
Technical Team, Wenatchee, Washington.

US Forest Service 1996. Nason Creek Stream Survey Report

Murdoch, A., and Peterson, K. 2000. Freshwater Production and Emigration
of Juvenile Spring Chinook from the Chiwawa River in 2000. Washington
State Department of Fish and Wildlife

# 

# 

# Appendix A

Nason Creek mean daily stream discharge (cfs) and temperature (c)
recorded at Rk 0.8, provided by Washington State Depart of Ecology (J.
Peterson, pers. comm.).

  ------------ ----------- ----------- --------- ------------ ----------- -----------
  **Date**     **Average   **Average             **Date**     **Average   **Average
               Daily CFS** Daily Temp                         Daily CFS** Daily Temp
                           C**                                            C**

  3/1/2004     134         3.9                   4/11/2004    841         5.5

  3/2/2004     133         3.3                   4/12/2004    1080        5.6

  3/3/2004     133         2.9                   4/13/2004    1380        4.9

  3/4/2004     138         3.3                   4/14/2004    1170        4.8

  3/5/2004     140         1.6                   4/15/2004    904         5.0

  3/6/2004     133         2.1                   4/16/2004    694         4.8

  3/7/2004     156         3.3                   4/17/2004    569         5.4

  3/8/2004     316         3.9                   4/18/2004    521         5.0

  3/9/2004     366         3.7                   4/19/2004    492         5.2

  3/10/2004    388         3.4                   4/20/2004    481         5.8

  3/11/2004    363         3.5                   4/21/2004    462         5.3

  3/12/2004    368         3.9                   4/22/2004    451         6.5

  3/13/2004    360         3.6                   4/23/2004    487         5.9

  3/14/2004    361         4.4                   4/24/2004    474         5.6

  3/15/2004    383         4.4                   4/25/2004    467         6.4

  3/16/2004    396         4.6                   4/26/2004    548         7.0

  3/17/2004    426         4.8                   4/27/2004    982         5.9

  3/18/2004    443         4.1                   4/28/2004    938         5.7

  3/19/2004    419         3.5                   4/29/2004    776         6.2

  3/20/2004    379         3.6                   4/30/2004    876         6.6

  3/21/2004    362         4.3                   5/1/2004     1220        6.6

  3/22/2004    373         5.1                   5/2/2004     1680        6.6

  3/23/2004    437         5.0                   5/3/2004     1750        6.4

  3/24/2004    458         4.6                   5/4/2004     1700        6.5

  3/25/2004    445         3.7                   5/5/2004     1490        6.0

  3/26/2004    442         4.3                   5/6/2004     1060        5.7

  3/27/2004    427         5.0                   5/7/2004     1020        6.6

  3/28/2004    420         4.9                   5/8/2004     1210        6.3

  3/29/2004    421         5.2                   5/9/2004     1070        6.5

  3/30/2004    446         4.8                   5/10/2004    896         6.2

  3/31/2004    433         4.2                   5/11/2004    674         6.5

  4/1/2004     404         4.5                   5/12/2004    607         6.5

  4/2/2004     394         4.9                   5/13/2004    608         6.6

  4/3/2004     410         5.3                   5/14/2004    609         7.0

  4/4/2004     451         6.0                   5/15/2004    638         6.7

  4/5/2004     482         5.6                   5/16/2004    640         7.2

  4/6/2004     499         5.7                   5/17/2004    605         6.6

  4/7/2004     575         6.0                   5/18/2004    764         7.0

  4/8/2004     635         5.6                   5/19/2004    1130        7.6

  4/9/2004     664         5.4                   5/20/2004    1280        7.5

  4/10/2004    700         5.5                   5/21/2004    1370        7.7

  **Date**     **Average   **Average             **Date**     **Average   **Average
               Daily CFS** Daily Temp                         Daily CFS** Daily Temp
                           C**                                            C**

  5/22/2004    1200        7.0                   7/8/2004     146         13.1

  5/23/2004    1080        6.7                   7/9/2004     134         13.7

  5/24/2004    900         6.8                   7/10/2004    126         13.2

  5/25/2004    731         7.0                   7/11/2004    121         14.0

  5/26/2004    1180        7.5                   7/12/2004    115         14.9

  5/27/2004    1420        6.7                   7/13/2004    112         15.2

  5/28/2004    1080        6.6                   7/14/2004    105         16.2

  5/29/2004    701         7.1                   7/15/2004    106         16.8

  5/30/2004    922         7.1                   7/16/2004    102         16.8

  5/31/2004    921         7.0                   7/17/2004    98          17.1

  6/1/2004     616         7.5                   7/18/2004    103         16.5

  6/2/2004     556         8.1                   7/19/2004    104         16.6

  6/3/2004     637         8.9                   7/20/2004    98          16.2

  6/4/2004     944         9.6                   7/21/2004    90          16.5

  6/5/2004     1060        9.2                   7/22/2004    83          17.7

  6/6/2004     841         8.3                   7/23/2004    78          17.6

  6/7/2004     568         8.0                   7/24/2004    74          18.0

  6/8/2004     498         8.7                   7/25/2004    69          18.8

  6/9/2004     498         8.9                   7/26/2004    65          18.2

  6/10/2004    543         9.3                   7/27/2004    62          17.6

  6/11/2004    492         8.4                   7/28/2004    60          17.8

  6/12/2004    438         8.3                   7/29/2004    56          18.6

  6/13/2004    472         9.0                   7/30/2004    53          19.1

  6/14/2004    492         8.3                   7/31/2004    51          18.8

  6/15/2004    433         8.4                   8/1/2004     48          18.8

  6/16/2004    409         9.8                   8/2/2004     47          18.8

  6/17/2004    420         10.8                  8/3/2004     49          18.7

  6/18/2004    440         11.2                  8/4/2004     47          18.0

  6/19/2004    424         10.7                  8/5/2004     55          17.6

  6/20/2004    399         11.1                  8/6/2004     55          15.4

  6/21/2004    403         12.0                  8/7/2004     76          15.2

  6/22/2004    406         12.5                  8/8/2004     60          16.3

  6/23/2004    402         12.7                  8/9/2004     46          16.9

  6/24/2004    399         12.8                  8/10/2004    38          17.7

  6/25/2004    388         13.6                  8/11/2004    35          18.3

  6/26/2004    354         13.7                  8/12/2004    34          18.6

  6/27/2004    314         13.5                  8/13/2004    33          18.9

  6/28/2004    285         13.7                  8/14/2004    32          18.8

  6/29/2004    260         13.9                  8/15/2004    31          19.1

  6/30/2004    240         13.6                  8/16/2004    32          19.5

  7/1/2004     223         14.0                  8/17/2004    37          19.3

  7/2/2004     200         14.2                  8/18/2004    35          19.1

  7/3/2004     185         14.6                  8/19/2004    34          19.1

  7/4/2004     175         14.4                  8/20/2004    32          19.2

  7/5/2004     159         14.7                  8/21/2004    29          18.5

  7/6/2004     152         14.6                  8/22/2004    33          17.5

  7/7/2004     163         13.7                  8/23/2004    41          16.6

  **Date**     **Average   **Average             **Date**     **Average   **Average
               Daily CFS** Daily Temp                         Daily CFS** Daily Temp
                           C**                                            C**

  8/24/2004    73          15.6                  10/10/2004   78          8.6

  8/25/2004    122         14.2                  10/11/2004   78          9.0

  8/26/2004    108         14.6                  10/12/2004   82          9.7

  8/27/2004    73          14.8                  10/13/2004   77          9.5

  8/28/2004    63          15.3                  10/14/2004   77          9.3

  8/29/2004    59          16.1                  10/15/2004   71          10.1

  8/30/2004    51          16.4                  10/16/2004   79          10.8

  8/31/2004    45          16.2                  10/17/2004   122         9.9

  9/1/2004     43          15.9                  10/18/2004   166         8.3

  9/2/2004     73          13.8                  10/19/2004   153         7.7

  9/3/2004     71          12.6                  10/20/2004   147         7.8

  9/4/2004     55          13.0                  10/21/2004   155         7.4

  9/5/2004     48          13.8                  10/22/2004   154         7.1

  9/6/2004     45          13.6                  10/23/2004   186         6.2

  9/7/2004     38          14.2                  10/24/2004   164         5.5

  9/9/2004     38          14.1                  10/25/2004   151         4.9

  9/8/2004     35          14.3                  10/26/2004   142         5.2

  9/10/2004    40          13.4                  10/27/2004   135         4.9

  9/11/2004    108         14.0                  10/28/2004   132         4.6

  9/12/2004    88          13.1                  10/29/2004   128         5.2

  9/13/2004    70          11.8                  10/30/2004   163         5.5

  9/14/2004    276         10.7                  10/31/2004   159         4.4

  9/15/2004    272         10.0                  11/1/2004    539         3.3

  9/16/2004    321         9.7                   11/2/2004    918         2.9

  9/17/2004    298         10.0                  11/3/2004    637         3.4

  9/18/2004    247         9.7                   11/4/2004    356         3.1

  9/19/2004    216         9.2                   11/5/2004    308         3.1

  9/20/2004    186         9.2                   11/6/2004    279         3.3

  9/21/2004    162         9.5                   11/7/2004    284         4.3

  9/22/2004    148         9.8                   11/8/2004    301         4.2

  9/23/2004    142         10.5                  11/9/2004    282         3.9

  9/24/2004    131         10.6                  11/10/2004   269         4.2

  9/25/2004    122         10.5                  11/11/2004   254         3.7

  9/26/2004    114         10.7                  11/12/2004   239         3.3

  9/27/2004    107         10.7                  11/13/2004   227         4.0

  9/28/2004    101         10.8                  11/14/2004   220         4.4

  9/29/2004    96          11.1                  11/15/2004   214         4.4

  9/30/2004    91          10.8                  11/16/2004   204         4.3

  10/1/2004    86          9.8                   11/17/2004   208         3.8

  10/2/2004    82          9.4                   11/18/2004   193         3.2

  10/3/2004    79          9.3                   11/19/2004   183         3.4

  10/4/2004    76          9.1                   11/20/2004   167         2.6

  10/5/2004    73          9.0                   11/21/2004   160         2.1

  10/6/2004    76          10.2                  11/22/2004   164         3.2

  10/7/2004    82          9.8                   11/23/2004   167         3.6

  10/8/2004    75          9.3                   11/24/2004   308         4.6

  10/9/2004    78          9.1                   11/25/2004   1490        4.6

  **Date**     **Average   **Average                                      
               Daily CFS** Daily Temp                                     
                           C**                                            

  11/26/2004   509         3.5                                            

  11/27/2004   401         3.1                                            

  11/28/2004   341         2.1                                            

  11/29/2004   308         1.4                                            

  11/30/2004   289         1.8                                            

  12/1/2004    267         2.3                                            

  11/26/2004   509         3.5                                            

  11/27/2004   401         3.1                                            

  11/28/2004   341         2.1                                            

  11/29/2004   308         1.4                                            

  11/30/2004   289         1.8                                            

  12/1/2004    267         2.3                                            
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