Owner Operated since 1997

Full Service Hydrographics

Monitoring and instrumentation, field measurements, telemetry, data analysis, and construction for stream gauging, meteorological, and snow monitoring stations across the Sierra Nevada and beyond.

  • 1997 Owner operated since
  • USGS Approved measurement and record methods
  • ACOE Primary contractor, Sacramento Water Management Section

Our Services

From instrument selection to published records, we cover every step of a monitoring program.

Solar-powered meteorological station on a mountain ridge

Monitoring and Instrumentation

Recommendation, Installation, and Calibration of Instrumentation

Surface Water

  • Level/Stage/Elevation
  • Flow
  • Storage
  • Water Temperature

Meteorological

  • Air Temperature
  • Humidity
  • Precipitation
  • Snow Depth
  • Snow Water Content
  • Solar and Infrared Radiation
  • Barometric Pressure
  • Soil Moisture and Temperature
  • Wind Speed and Direction
  • Remote Cameras
Hydrographers measuring flow from a cableway car below a dam

Measurements and Field Data Collection

  • Monthly Site Inspections
  • Flow Measurements Using USGS Approved Methods
    • Current Meters AA and Pygmy
    • Acoustic Doppler Current Profiler (ADCP)
  • Dam Leakage and Piezometer Readings
  • Snow Surveying
  • Surveying
    • Differential Levels
    • Total Station
Open datalogger and radio enclosure at a remote mountaintop station

Telemetry and System Integration

  • Onsite Data Logging
  • Remote Telemetry
    • Licensed and Unlicensed Terrestrial Radios
    • GOES Satellite
    • Cell Modem
  • Real Time Database
  • Web Portal Data Access
  • Data Notification Email and Text Messages
  • Integration Options with Many Systems
Water flowing over a concrete measurement weir

Data Analysis and Computation

  • Monthly Record Work-Up Using USGS Approved Methods
  • Yearly Analysis for USGS Review and Publication
  • Reporting and Documentation
  • Flow Duration Curve Calculations
  • Digitizing Capabilities
  • Relational Flow Comparisons
  • Environmental Studies
  • Flow Record Analysis
  • Meteorological Analysis
Crew setting rebar for a remote station foundation

Construction

  • Construction Consultation
  • Remote Site Installation Expertise
    • Gauging Stations
    • Meteorological Stations
    • Snow Monitoring Stations
  • Station and Cableway Maintenance
  • Trail Maintenance

About Us

We’re a small company doing big things

Owner Operated since 1997

Currently Sierra Hydrographics is the primary contractor for the Army Corps of Engineers Water Management Section in Sacramento. Our contract with the ACOE is to provide flow measurements, record analysis, and maintenance of their stream gauging stations as well as maintenance of their meteorological stations.

Sierra Hydrographics field trucks and helicopter

Our Humble Beginnings

It all started in South Central Los Angeles: Dan Garrigue was happily performing his maintenance duties ensuring the good people of the greater LA area were being well served by their electrical company. One day, Dan happened on a job opening for a hydrographer in the Sierra Nevada Mountain Range of Central California.

Dan thought:

what the heck is a hydrographer?

Well that doesn’t much matter, cuz they got good fishin’ up in them hills, and heck, who wouldn’t want to live in the Sierra Nevada’s anyway. No offense LA, but Dan had to go…

note: a hydrographer is a fancy term for water measurerer

In the mean time a fiery little gun toten nurse (well she wasn’t gun toten at the time) named Dotty (her last name wasn’t Garrigue yet, either!) was busy saving lives at the company infirmary (it’s a tough job up in the mountains you know).

Well, you guessed it, they fell in love and got married. We’ll fast forward past all that goopy romantic stuff.

Dan being the best water measurer around set out along side Dotty to seek some streams of their own to wade. So Dotty baked some cookies and they went to see some important people and found a stream to measure. They measured the stream as studiously as anybody ever has.

It was then that the mighty Army Corps of Engineers said to Dan and Dotty.

You have done well measuring the stream for which you have been tasked. Now we would like you to measure many streams and rivers, and some snow too. Then you will build mighty things, and use radios!

Dotty and Dan dutifully ventured into many lands, working many hours braving all sorts of adventures.

And that was the beginning.

Dan and Dotty are still Whippin & Dippin to this very day!!

Our Team

The people measuring, building, and maintaining your stations.

  • Dan Garrigue

    Dan Garrigue

  • Dotty Garrigue

    Dotty Garrigue

  • Mike Medlin

    Mike Medlin

  • Brandon Hunsbarger

    Brandon Hunsbarger

  • Steve Rosier

    Steve Rosier

  • Geoff Allen

    Geoff Allen

  • Steve Neal

    Steve Neal

  • Kami Chambers

  • Ben Lanier

  • Connor Souchek

Contact Us

Our line of work takes us to some interesting places, but you can always get a hold of us!

If you have any questions about our services, please do not hesitate to give us a call. We will be happy to answer your questions and look forward to possibly working with you in the future.