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The flow status indicates how yesterday's daily average flow compares to the normal flow for this date. This helps you understand if a stream is running higher or lower than typical for this time of year.
Yesterday's Flow: The mean daily discharge from yesterday (average of all measurements over 24 hours). This provides a more accurate representation than a single instantaneous reading, especially for rivers affected by hydroelectric operations or daytime snowmelt.
Normal Flow: The historical average flow for this calendar day over the past 10 years (e.g., the average flow for October 19th from 2015-2025).
Percentage of Normal: Calculated as:
(Yesterday's Flow ÷ Normal Flow) × 100%
| Yesterday's flow is ... | ||
| Above Normal (Blue): | >125% of the historical average | |
| Normal (Green): | 75-125% of the historical average | |
| Below Normal (Orange): | <75% of the historical average | |
| No Data (Gray): | Station has insufficient historical data |
If a stream's yesterday's flow is 180 cfs and the normal flow for this date is 200 cfs, the percentage would be 90% (180 ÷ 200 × 100). This falls in the Normal range (75-125%), indicating the stream is flowing at a typical rate for this time of year.
Data provided for informational purposes only. Streamflow and temperature data is sourced from USGS and may not be completely accurate or up-to-date. Data may be delayed, contain errors, or be unavailable. Do not rely on this information for safety-critical decisions or navigation. Always verify conditions with official sources before recreating on or near waterways.