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Discussion Starter · #1 ·
Check back on this thread for updates posted as comments/replies.

To get started, the Colorado Flood Threat Outlook (Flood Threat Outlook) is predicting: "Willow Park (a high altitude Snotel site), for example, is currently about 35% above the seasonal median, which could increase to 50-70% above median after the next precipitation event May 8 - 11. This, coupled with the expectation of above normal temperatures by late next week (May 14 & 15) means we will be watching out for snowmelt-induced flooding, most notably in the Big Thompson and Cache La Poudre basins."

Lately, the Olympus Dam releases to the Big Thompson River have been around 200 cfs, but hydro power generation has been limited due to power line maintenance ending this week, so we might start to see some of the east-slope runoff skimmed off for power generation. Time will tell. Based on years prior to 2020, it was hard to predict how much the actual releases would be - up one day, down the next. 2020 was unusual because there was a maintenance project so we had higher water in the Big Thompson all summer.
 

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Discussion Starter · #2 ·
Tuesday, May 18, 2021
Olympus Dam Release to the Big Thompson River

0100 - 2400 -- Adjust the flow from 383 cfs to 488 cfs
 

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Discussion Starter · #3 ·
Thursday, May 20, 2021
Olympus Dam Release to the Big Thompson River
0000 - 2400 -- Adjust the flow from 470 cfs to 250 cfs. (250 cfs = 484 cfs computed natural inflow + 96 cfs forecast runoff inflow - 330 cfs Oly skim)

If they weren't skimming off most of the flow for hydropower, the release would be 580 cfs.
 

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Discussion Starter · #4 ·
Friday, May 21, 2021

Olympus Dam Release to the Big Thompson River

0000 - 2400 -- Adjust the flow from 250 cfs to 294 cfs.

(293.6 cfs = 465 cfs computed natural inflow + 67 cfs forecast runoff inflow – 238.4 cfs Oly skim)

The 'skim' is east slope runoff water that should come through Olympus Dam into the Big T, but the Bureau of Rec is allowed to skim it off to use for generating hydropower.
 

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Discussion Starter · #5 ·
Saturday, May 22, 2021

Olympus Dam Release to the Big Thompson River



0100 - 2400 -- Adjust the flow from 294 cfs to 319 cfs.
 

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Discussion Starter · #6 ·
Sunday, May 23, 2021
Olympus Dam Release to the Big Thompson River
0100 - 2400 -- Adjust the flow from 319 cfs to 303 cfs.
 

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Discussion Starter · #7 ·
Tuesday, May 25, 2021 - 200 cfs

Olympus Dam Release to the Big Thompson River


0000 - 2400 -- Adjust the flow from 450 cfs to 200 cfs. (200 cfs = 500 cfs forecasted inflow - 300 cfs Oly skim)
 

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Discussion Starter · #8 ·
Not good news for Kayakers:
Friday, May 28, 2021- 145 cfs
Olympus Dam Release to the Big Thompson River


(145 cfs = 548.4 cfs computed natural inflow - 63.4 cfs Oly skim - 340 cfs Big Thompson priority water).

Without the diversion, we'd be seeing 548 cfs in the Big Thompson!
 

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Discussion Starter · #9 ·
Olympus Tunnel diversion will stop for a maintenance outage on Monday, 7 June for approximately 8 hours.
Monday, June 7, 2021
Olympus Dam Release to the Big Thompson River
0000 - 0300 -- Maintain a flow of 475 cfs (Estimated average inflow 991 cfs = average release 685 cfs + average priority diversion 306 cfs).
0300 - 0400 -- Adjust the flow from 475 cfs to 525 cfs.
0400 - 0500 -- Adjust the flow from 525 cfs to 575 cfs.
0500 - 0600 -- Adjust the flow from 575 cfs to 625 cfs.
0600 - 0700 -- Adjust the flow from 625 cfs to 675 cfs.
0700 - 0800 -- Adjust the flow from 675 cfs to 725 cfs.
0800 - 0900 -- Adjust the flow from 725 cfs to 775 cfs.
0900 - 1800 (9 am - 6 pm) - Adjust the flow from 775 cfs to 800 cfs.
1800 - 1900 -- Adjust the flow from 800 cfs to 750 cfs.
1900 - 2000 -- Adjust the flow from 750 cfs to 700 cfs.
2000 - 2100 -- Adjust the flow from 700 cfs to 650 cfs.
2100 - 2200 -- Adjust the flow from 650 cfs to 600 cfs.
2200 - 2400 -- Adjust the flow from 600 cfs to 550 cfs.
 

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Discussion Starter · #10 ·
Wednesday, June 9, 2021
Olympus Dam Release to the Big Thompson River
0000 - 2400 -- Adjust the flow from 625 cfs to 520 cfs (1070 cfs Estimated inflow - 550 cfs C-BT Priority Water).

"Priority Water" means the Bureau of Rec is able to divert it to store in the reservoirs instead of letting it go on down to Nebraska.
 

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Discussion Starter · #11 ·
Thursday, June 10, 2021 - decrease to 320 cfs


Olympus Dam Release to the Big Thompson River



0000 - 2400 -- Adjust the flow from 420 cfs to 320 cfs (992 cfs calculated inflow - 550 cfs C-BT Priority Water - 122 Priority Water Lake Estes).
 

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Discussion Starter · #12 ·
Friday, June 11, 2021


Olympus Dam Release to the Big Thompson River



0000 - 2400 -- Adjust the flow from 220 cfs to 190 cfs (920 cfs calculated inflow - 550 cfs C-BT Priority Water - 180 Priority Water Lake Estes).
 

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Discussion Starter · #13 ·
Saturday, June 12, 2021
Olympus Dam Release to the Big Thompson River

0000 - 2400 -- Adjust the flow from 290 cfs to 332 cfs (882 cfs calculated inflow - 550 cfs C-BT Priority Water).
 

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Discussion Starter · #14 ·
Monday, June 14, 2021
Olympus Dam Release to the Big Thompson River
0000 - 2400 -- Maintain a flow of 125 cfs (125 cfs = 736 cfs calculated inflow - 480 cfs C-BT Priority Water - 70 cfs Oly Skim - 61 cfs Native water held at Lake Estes).
 
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