Sources
Last updated: October 17, 2026
lakepeek only shows data from these sources. We read official APIs and files that are published for public use; we do not use logos or seals of any agency, and nothing here is an official government product.
U.S. Army Corps of Engineers, Access to Water
What we use: Latest lake level, conservation storage, inflow and outflow, and pool levels (normal pool, top of flood pool, pool of record) for every Corps project lake in Oklahoma, Texas, Kansas, Arkansas and Missouri. One request per district per hour.
Where: water.usace.army.mil (district reports, JSON)
License: Work of the U.S. federal government, not subject to copyright (17 U.S.C. 105).
Credit on the page: Source: U.S. Army Corps of Engineers, {district} (provisional data)
U.S. Army Corps of Engineers, CWMS Data API
What we use: Hourly lake elevations, reduced to one value per day (the reading closest to noon, Central time), for the charts and the history since January 2016.
Where: cwms-data.usace.army.mil
License: Work of the U.S. federal government (17 U.S.C. 105).
Credit on the page: Source: U.S. Army Corps of Engineers
Texas Water Development Board, Water Data for Texas
What we use: Daily level and percent of conservation storage for Texas reservoirs; the full record for Lake Texana.
Where: waterdatafortexas.org (daily CSV files)
License: Public data of the State of Texas. TWDB describes the values as best estimates and makes no warranties; recent data are provisional.
Credit on the page: Source: Texas Water Development Board
U.S. Geological Survey, Water Data API
What we use: Location of the lake gauge, for lakes where the Corps feed has no coordinates.
Where: api.waterdata.usgs.gov
License: USGS-authored data are in the U.S. public domain.
Credit on the page: Source: U.S. Geological Survey
National Weather Service API
What we use: Wind now and the 3-day forecast at each dam, every 3 hours, shown as issued.
Where: api.weather.gov
License: Public domain, free to use. We do not modify the forecast or present it as an official product, and we do not use NWS logos.
Credit on the page: Forecast: National Weather Service
NOAA CO-OPS Tides and Currents API
What we use: Predicted times and heights of high and low tides, 13 months ahead, for the reference station nearest each town.
Where: api.tidesandcurrents.noaa.gov
License: Information on NOAA servers is in the public domain. Predictions are shown unmodified; they are not observed water levels.
Credit on the page: Predictions from NOAA station {id}
U.S. Census Bureau, Gazetteer files (2024)
What we use: Coordinates of each beach town, to pick the nearest tide station and to compute distances.
Where: census.gov
License: Work of the U.S. federal government (17 U.S.C. 105).
Credit on the page: Not shown (used for distances only)
Astronomy Engine (open-source library)
What we use: Sunrise, sunset and moon phase on the tide pages, calculated on our side.
Where: github.com/cosinekitty/astronomy
License: MIT license.
Credit on the page: Not shown (calculation)
What we do not use
- Modeled or estimated water temperatures (from air temperature). We show water temperature only where a sensor measures it.
- Weather data with a non-commercial license.
- Websites that do not offer open access to automated readers.
Sources last checked on October 17, 2026. Found something wrong? Please write to us from the contact page.