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Development of Water Quality Standards for Willard Spur
2011 Hydrology & Nutrient Loads
Willard Spur Science Panel
April 5, 2012
Photo:Josh Noble
What was our objective for 2011?
• Understand the sources, quantity, timing, and mechanisms of water and nutrient loading
• Relative contribution of the POTW
Note: Recognized that 2011 was potentially a wet year
• April 2011 snowpack: 185% of normal• April 2012 snowpack: 65% of normal
What we did in 2011
• Mapped and measured inflows• Monitored nutrients in inflows• Measured outflow• Monitored weather• Monitored water surface elevations
Something to consider….
• What does the data mean in the context of our overall objectives?
• How does this influence what we do in 2012?
Overall Inflows (2011)
Willard Bay
Bear River @ Corinne
BRMBR
Water levelDid Willard Spur close off in 2011/2012?
“weir”
BRMBR Inflows (2011)
Residence Time of Water
Month Full Volume RT(days)
2/3 Volume RT(days)
June 4 3August 14 9
September 17 11October 14 9
Note: Estimate assumes constant pool elevation
How did 2011 compare to recent record?
Apparent elevation where GSL changes salinity of Willard Spur = 4201.8ft
Observations
• 2011 represented a very wet year– Does not appear to have “closed”, rare
event since floods of 1980’s• Bear River most significant source of
flow followed by Willard Bay, Harold Crane WMA
• Residence times increased
Nutrient Loads
• Estimated from flow volume and discrete water quality samples (~1/mth)– LOADEST model requires more sample
points than what we have– Used spreadsheet to estimate preliminary
loads– Still trying to address discrepancies in flow
data for Harold Crane WMA
0
100,000
200,000
300,000
400,000
500,000
600,000
June, 2011 July, 2011 August, 2011 September, 2011
Nut
rient
Loa
ds (l
bs/m
onth
)
Trend of Total Nutrient Loads to Willard Spur
Total Nitrogen
Total Phosphorus
0
10,000
20,000
30,000
40,000
50,000
60,000
70,000
June, 2011 July, 2011 August, 2011 September, 2011Tota
l Pho
spho
rus
Load
s (lb
s/m
onth
)
Trend of Phosphorus Loads to Willard Spur
BRMBR
Willard Bay
Willard/Perry WWTP
0
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
June, 2011 July, 2011 August, 2011 September, 2011Tota
l Nitr
ogen
Loa
ds (l
bs/m
onth
)
Trend of Nitrogen Loads to Willard Spur
BRMBR
Willard Bay
Willard/Perry WWTP
0.07%
10.35%
89.59%
0.00%
June, 2011 - Total Phosphorus Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA
0.16%
13.51%
86.33%
0.00%
June, 2011 - Total Nitrogen Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA
0.93%
0.71%
98.35%
0.00%
July, 2011 - Total Phosphorus Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA
1.42%
0.96%
97.63%
0.00%
July, 2011 - Total Nitrogen Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA
3.20%
0.50%
96.31%
0.00%
August, 2011 - Total Phosphorus Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA
2.78%
0.62%
96.60%
0.00%
August, 2011 - Total Nitrogen Loads to Willard Spur
Willard Perry WWTP
Willard Bay
Bear River Refuge
Harold Crane WMA