CRSS-ready Temperature-Adjusted Colorado River Inflows

Resource type: Composite Resource
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Created: Aug 29, 2021 at 9:16 p.m.
Last updated: Sep 07, 2021 at 10:26 p.m.
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This dataset holds CRSS-ready flow sequences adjusted for temperature increases in the 21st century (2018 to 2100) as well as temperature increases that occurred during the natural flow period from 1906 to 2017. These flow traces were produced using the methods described in the file memo by Udall (2020). This study developed six different temperature-adjusted natural flow datasets based on considering three different temperature sensitivities (-3%/°C, -6.5%/°C, and -10%/°C) times two different temperature projections (RCP4.5 and RCP8.5). The flows were generated by modifying the existing Reclamation natural flow dataset (USBR, 2019) at each of the 29 Colorado River Simulation System (CRSS) natural inflow sites. Two main steps of temperature adjustment process in this study were: 1- Create a set of natural flows that would have occurred were temperatures constant from 1906 to 2017 assuming 2017 temperatures, and 2- Further adjust downward the constant 2017 temperature flows to account for expected losses due to warming in the 21st century. The flow data are provided in an CRSS-ready Indexed Sequential Method (ISM) series with a starting year of 2018 and an ending year of 2100.

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Resource Level Coverage


Coordinate System/Geographic Projection:
WGS 84 EPSG:4326
Coordinate Units:
Decimal degrees
North Latitude
East Longitude
South Latitude
West Longitude



This resource contains 2018-2100 temperature adjusted flows computed by Brad Udall.  

Methods are described in Temp_Adjusted_Flows_August_4_2020.pdf.

There are 16 data files in each of 3 subdirectories. These are the results from
the project. These files are CRSS - ready. 

a) The subdirectories are:

1) Monthly_Timestamped (like 2 below, except Column 1 has a year-month timestamp)

2) Monthly 
996 rows or one per month from 1/1/2018 to 12/1/2100
112 columns or one per ISM Trace

3) Annual

83 rows, or one per year from 2018 to 2100
112 columns or one per ISM trace

This is the data in 2 above summed by month.

b) The 16 files in each subdirectory arise from the following combinations:

2 RCPs * 4 Temperature Sensitivities * 2 kinds of flows (Total and Intervening)

Names are as follows:

Intervening / Total | RCP45/RCP85 | 000/030/065/100 

c) Each XLSX has 29 tabs, one per inflow point.

Total and Intervening flows will be the same at the very top of a reach, but at not the 
same as one proceeds down a reach. Total flows are the total of all intervening flows
above a given location. 

The tab names should be recognized by CRSS as one of the 29 inflow points. 

Note that the files with temperature adjustment 0 (e.g. CRB_Intervening_Natural_Flows_Annual_RCP45_000_.xlsx, CRB_Intervening_Natural_Flows_Annual_RCP85_000_.xlsx
CRB_Total_Natural_Flows_Annual_RCP85_000_.xlsx for annual flows) effectively just repeat the raw natural flow data from the reclamation database.

This File was produced August 4, 2020, and updated September 3, 2021 for upload to HydroShare.



Derived From: USBR, (2019), "Colorado River Basin Natural Flow and Salt Data," U.S. Bureau of Reclamation, Last modified March 18, 2019,

How to Cite

Udall, B. (2021). CRSS-ready Temperature-Adjusted Colorado River Inflows, HydroShare,

This resource is shared under the Creative Commons Attribution CC BY.


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