HydroMap LLC
Engineering intelligence for water resources.
We build the software, data systems, and models that help agencies, utilities, and researchers understand water risk and make better decisions — from the watershed to the stream reach.
Free, no login — live streamflow, snowpack, reservoirs, and forecasts for every U.S. watershed.
What we do
Modern engineering for hydrologic decision-making.
Live now · free to use
HydroMap Explorer — every U.S. watershed, one click away.
Our flagship web app puts live water data on an interactive national map. Click any HUC-8 watershed to see USGS streamgages color-coded by flow condition, SNOTEL snowpack, and reservoirs — with National Water Model and GEOGLOWS forecasts drawn on every hydrograph, and an AI assistant that answers questions from the live data on screen.
The HydroMap Network
Focused live dashboards for the waters people care about.
The engine behind HydroMap Explorer powers a Data Watch for individual lakes — from Utah's inland sea to the two lowest lakes on Earth. Every one is free, updates itself from official public data, and answers questions with an AI grounded only in the numbers on the page.
Great Salt Lake Data Watch
UtahBoth arms' levels updated daily against the state's healthy range, the record back to 1847, river inflows with official forecasts, the causeway lakebed cross-section, and Landsat then-and-now extent.
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Lake Powell Data Watch
Utah · ArizonaLive level against the power pool, every launch ramp's status computed from today's water, the official 24-month outlook, shoreline maps at any elevation, and weather for the whole lake.
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Lake Mead Data Watch
Nevada · ArizonaThe largest reservoir in the U.S., within a foot of its all-time record low — live level against the shortage tiers, the USBR 24-month outlook that breaks the record within weeks, ramp-by-ramp access, and the Colorado River story behind Hoover Dam.
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Flaming Gorge Data Watch
Utah · WyomingLive level and the 2026–27 drought drawdown to Lake Powell, every boat ramp's status against its surveyed cutoff, the Green River inflow and dam release, and the red canyon John Wesley Powell named in 1869.
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Utah Lake Data Watch
UtahThe one that answers “can I swim today?” — official Utah DEQ algae advisories beach by beach, the level against its statutory compromise ceiling, four tributaries with forecasts, and the outflow that feeds the Great Salt Lake.
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Bear Lake Data Watch
Utah · IdahoThe Caribbean of the Rockies on a 122-year daily record — today's level against full pool and the irrigation reserve, the river-in/pumped-out plumbing at Rainbow and Lifton, DEQ algae advisories beach by beach, and the January cisco run.
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Sand Hollow Data Watch
UtahUtah's most-visited state park, tracked by monthly storage against its 51,360 acre-foot capacity — plus the aquifer bank beneath the red rock, official swim advisories, the mercury advisory on bass, and the Virgin River that fills it.
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Sea of Galilee Data Watch
IsraelThe Kinneret's daily level against Israel's statutory red lines since 1966, the world-first desalinated refill, a 55-year salinity record, live earthquakes beneath the lake, and the shore's holy sites.
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Dead Sea Data Watch
Israel · JordanThe official level record of the lowest place on Earth since 1976 — a meter lost every year — with the sinkhole story, float-safety guidance, and half a century of satellite change.
Open the Data WatchMore waters are on the way. Want a Data Watch for your lake? Talk to us.
Trusted collaborators over two decades
Featured project
RIVR — The National Water Model in your pocket.
RIVR is a mobile application delivering real-time river flow information, short-term NWM forecasts, and 100-year flow benchmarks for any stream reach in the United States. Built on a high-availability NWM API and a spatial reach index, RIVR puts operational-grade hydrology in the hands of hydrologists, emergency managers, and the public.
Capabilities
Engineering depth across software, GIS, and hydrology.
HydroMap combines decades of applied water resources experience with modern software practice to deliver tools that agencies and researchers actually use in production.
Water Modeling
National Water Model integration, flood inundation mapping, and forecast post-processing for agencies and utilities.
Software Engineering
Custom GIS plugins, desktop and mobile applications, and hydroinformatics tools in .NET, Python, and JavaScript.
Hydroinformatics
Hydrologic information systems, CUAHSI / WaterML data services, and API design for environmental observations.
GIS Consulting
Geospatial analytics, watershed modeling workflows, and spatial decision-support systems for public and private clients.
Expert Witness
Technical consulting and reports in software patent, GIS, and hydrologic engineering litigation.
Research Collaboration
Agency and university partnerships on federally funded water research and operational forecasting infrastructure.
Have a water data or software challenge?
We take on a limited number of engagements each year. Tell us what you're working on — we'll tell you whether we're a good fit.