What to Check Before Starting Montana Irrigation Each Spring

Overview and why a spring check matters

Starting irrigation in Montana is not simply a matter of turning valves on when temperatures rise. Montana’s climate, varied elevations, long winters, and the legal framework around water use make spring startup an operation that requires planning, inspection, and careful execution. A thorough pre-season check reduces the risk of equipment damage, water waste, crop stress, regulatory violations, and costly emergency repairs mid-season.
This article gives a practical, step-by-step guide to what to inspect, test, and prepare before you bring water onto fields, lawns, or pastures. It covers mechanical systems, hydraulics, water sources, scheduling, safety, and recordkeeping with concrete details and actionable takeaways you can use on any farm, ranch, or irrigation enterprise in Montana.

Timing: when to begin checks

Start inspections well before you expect to irrigate. Ideal timing depends on elevation and local climate, but aim to begin:

after the last hard freeze in your immediate area, and
at least 2 to 4 weeks before the first planned irrigation to allow time for repairs and parts.

Beginning early gives you time to pressure-test lines, repair leaks, and coordinate with irrigation districts or suppliers.

Legal and administrative checks

Water rights, permits, and district coordination

Confirm your water rights, diversion schedules, and any temporary changes required by your irrigation district or the Montana Department of Natural Resources and Conservation (DNRC).

Verify appropriation amounts and authorized flow rates for the location and crop.
Check whether your diversion or headgate needs inspection or an annual meter read before startup.
If you are in an irrigation district, confirm your turnout dates, rotation schedule, and any special conservation orders.

Failing to follow water rights or district rules can result in fines or restriction of water deliveries.

Record reviews

Review last season’s records: pump run hours, flow meter logs, repair history, and irrigation scheduling notes. These records identify recurring issues and inform scheduling and maintenance priorities.

Water source and quality checks

Surface water diversions

Inspect headgates, screens, trash racks, and diversion boxes for winter damage, debris buildup, or animal burrows.

Remove ice,logs, and obstruction carefully to avoid sudden influxes of debris.
Check for bank erosion near intake structures that could change intake elevation or cause sediment problems.

Wells and groundwater systems

For wells and pumps, inspect static water level and perform a functional drawdown test if you suspect reduced capacity.

Measure static water level and compare to last season’s readings.
Run a short production test to confirm pump can deliver required flow at expected pressure; record dynamic water level and pump current draw.
Be alert for changes in water quality (iron, turbidity, sulfur) that can foul filters or clog laterals.

If you detect major changes in capacity or quality, consult a licensed well contractor or hydrogeologist.

Water quality parameters to note

Turbidity: high turbidity will require pre-filtration to avoid nozzle and emitter clogging.
pH and hardness: can affect corrosion and scaling in pumps and drip systems.
Biological issues: algal growth in reservoirs can cause filter and emitter issues and may require treatment.

Pump and power system inspection

Mechanical and electrical checks

Inspect pump housings, seals, packing glands, and shaft couplings for winter corrosion or damage.
Check electrical wiring, control panels, fuses, breakers, and ground fault protection for rodents chew damage and weathering.
Verify that starter and overload settings match the motor nameplate and that motor amperage at startup is within acceptable limits.

Never work on electrical equipment without proper lockout/tagout and PPE.

Pump performance verification

Perform a pump curve check or production test. Measure flow with a calibrated meter and pressure at the pump discharge and at a representative sprinkler or nozzle.

Compare measured flow and pressure to expected values from manufacturer or last-season data.
Note excessive current draw, vibration, or temperature at startup — these indicate mechanical binding, impeller blockage, or misalignment.

Distribution system: pipes, valves, and fittings

Visual inspections

Walk every accessible section of pipe and lateral. Look for:

Frost heave damage or broken joints from winter movement.
Visible leaks, sagging pipe, or displaced anchors.
Corrosion at couplers and flanges.

Replace or reinforce supports where pipe spans exceed recommended distances.

Valves, gates, and backflow prevention

Exercise all valves: open and close them fully to clear any debris and verify function.
Inspect backflow preventers and test assemblies that require annual certification; ensure they are not frozen or damaged.
For manual gates, lubricate stems and check handwheels for seized threads.

Pressure testing

Pressure-test pressurized sections after repairs to ensure they hold design pressure. Use a controlled, gradual pressurization to minimize water hammer.

Filters, screens, and nozzles

Filters and strainers

Clean and inspect all filters and strainers before startup. Replace worn elements and ensure filter housings and seals are intact.

For sand media or disk filters, check for media movement or cracked disks.
Check differential pressure gauges to confirm filter-to-filter consistency.

Nozzle and emitter maintenance

Clean or replace blocked sprinkler nozzles and drip emitters. Carry a set of spare nozzles sized to match the original application. Replace emitters showing flow degradation or physical damage.

Center pivots and movable equipment

Structural and mechanical inspection

Check tower alignment, tire pressure, gearboxes for oil level and leaks, and pivot drive motors for abnormal noise.
Inspect span joints, truss rods, and anchor bolts for fatigue or movement.
Verify sprinkler package orientation and replace damaged drop hoses, swath boundaries, or end guns.

Startup procedure for pivots

Visually inspect entire pivot for obstructions and remove debris.
Grease fittings on the pivot drivetrain and towers.
Check electrical connections and control panel settings.
Energize motor briefly to verify rotation direction and motor current.
Run pivot slowly under light load to seat seals and check for leaks before full-speed operation.

Irrigation scheduling and soil considerations

Soil moisture and infiltration tests

Before applying full irrigation, perform small test runs and soil probe checks to determine infiltration rates and baseline moisture.

Use a soil probe or auger to check moisture at root zone depths.
Conduct a simple infiltration test: apply a measured amount of water to a small area and time how long it takes to infiltrate to avoid runoff and pooling.

Matching flow to crop needs

Estimate seasonal water requirements using crop type, growth stage, and local evapotranspiration (ET) data. If you don’t have ET equipment, use local extension recommendations and weather station averages.

Ensure available flow matches required application depth for the intended interval. If not, adjust frequency and duration rather than forcing application rates the system cannot support.

Control systems and automation

Controllers and sensors

Verify irrigation controllers are programmed with current crop calendars, zone lengths, and allowable run times.
Test soil moisture sensors, flow sensors, rain shutoffs, and weather stations for accuracy and connectivity.
Replace controller batteries and backup power sources.

Remote monitoring and alarms

Confirm remote telemetry connections, alarm thresholds, and notification contacts. Early detection of anomalies reduces water loss and crop damage.

Freeze protection and winterization reversal

Check freeze protection devices: heat tracing, insulated enclosures, and pipe burial depths.

Ensure heat trace wiring is intact and thermostats operate.
For systems that were winterized with compressed air, remove plugs and open drains carefully; start filling slowly to purge air and avoid water hammer.
Confirm that buried valves previously closed for winterization are fully opened and operate smoothly.

Safety and environmental precautions

Use lockout/tagout for electrical and mechanical work.
Wear appropriate PPE: gloves, eye protection, hearing protection around pumps and motors.
Be aware of confined space risks around ponds and tanks; use proper ventilation and gas testing for wells and storage pits where hydrogen sulfide or methane may be present.
Dispose of filter backwash and chemical residues according to local rules; avoid contaminating streams and ditches.

Practical tools and spare parts to have on hand

Spare nozzles, emitters, filter elements, gaskets, and O-rings.
Repair clamps and couplers sized to system pipes.
Pressure gauges, flow meter or bucket/stopwatch for calibration, and a multimeter for electrical checks.
Pipe supports, threaded rods, and epoxy or sealant for emergency repairs.
Grease, lubricants, and hand tools sized for the equipment.

Common problems to expect and how to handle them

Reduced flow: check for clogged screens, collapsed suction lines, or pump wear. Test pump performance and check for leaks.
Clogged emitters/nozzles: increase filtration, backflush filters, and consider upgrading to finer filtration or chemical pretreatment if water quality is poor.
Electrical failures: check for tripped breakers, corrosion, or rodents. Do not repair live electrical components without a qualified electrician.
Air in lines: fill lines gradually and bleed air from high points; persistent air indicates a leak on the suction side or an improperly set foot valve.

Pre-startup checklist (practical, copyable)

Verify water rights, district requirements, and permits.
Inspect intake, screens, and diversion structures; remove debris.
Measure static water level and perform a short pump production test.
Inspect pumps, seals, couplings, and electrical controls; lockout/tagout before servicing.
Exercise and inspect all valves, backflow preventers, and pressure regulators.
Clean and test filters; replace elements and check differential gauges.
Walk laterals and visible piping for leaks, frost damage, or displacement.
Test sprinkler nozzles and drip emitters; carry spares.
Inspect center pivot towers, tires, gearboxes, and alignment.
Program or verify controllers, soil sensors, and remote monitoring.
Conduct a small infiltration test and probe soil moisture at root depths.
Start pressurization slowly; monitor pressure, flow, and pump motor current.
Confirm freeze protection systems and de-winterized drains are functional.
Review safety procedures and ensure PPE is available.

Final takeaways

Starting Montana irrigation without a methodical pre-season inspection invites equipment failure, wasted water, and regulatory friction. Begin early, test pumps and flows, inspect filters and nozzles, and verify controllers and safety systems. Keep good records, maintain spares, and coordinate with your irrigation district and local technical assistance (extension, conservation district, or licensed contractors) when needed. A careful startup not only protects equipment but also optimizes water use and helps ensure a productive growing season.