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Sweetwater Reservoir

Mountain bike trail conditions · San Diego, CA 32.690° N  116.979° W   351 FT Verified

DRY: Rideable

Wednesday, October 21st Conditions turn Caution.

Recent rain
0.2″ of rain, 5d ago
Today
93°Fcloudy
  • Wed 10/7, no measurable rain, daily high 97 degrees Fahrenheit, modeled conditions: DRY
  • Thu 10/8, no measurable rain, daily high 92 degrees Fahrenheit, modeled conditions: DRY
  • Fri 10/9, no measurable rain, daily high 90 degrees Fahrenheit, modeled conditions: DRY then DUSTY
  • Sat 10/10, 1.86 inches of rain, daily high 81 degrees Fahrenheit, modeled conditions: DUSTY then DRY then CAUTION then STAY OFF
  • Sun 10/11, 0.10 inches of rain, daily high 69 degrees Fahrenheit, modeled conditions: STAY OFF then CAUTION
  • Mon 10/12, 0.13 inches of rain, daily high 71 degrees Fahrenheit, modeled conditions: DRY then STAY OFF then CAUTION then DRY
  • Tue 10/13, no measurable rain, daily high 73 degrees Fahrenheit, modeled conditions: DRY
  • Wed 10/14, no measurable rain, daily high 81 degrees Fahrenheit, modeled conditions: DRY
  • Thu 10/15, no measurable rain, daily high 89 degrees Fahrenheit, modeled conditions: DRY
  • Fri 10/16, no measurable rain, daily high 95 degrees Fahrenheit, modeled conditions: DRY
  • Today, Sat 10/17, no measurable rain, daily high 93 degrees Fahrenheit, modeled conditions: DRY
  • Sun 10/18, no measurable rain, daily high 88 degrees Fahrenheit, modeled conditions: DRY
  • Mon 10/19, no measurable rain, daily high 83 degrees Fahrenheit, modeled conditions: DRY
  • Tue 10/20, no measurable rain, daily high 80 degrees Fahrenheit, modeled conditions: DRY
  • Wed 10/21, 0.47 inches of rain, daily high 80 degrees Fahrenheit, modeled conditions: DRY then CAUTION then DRY then STAY OFF, forecast preview, beyond the free window
  • Thu 10/22, 0.55 inches of rain, daily high 71 degrees Fahrenheit, modeled conditions: STAY OFF then CAUTION, forecast preview, beyond the free window
Updated

Updated Saturday, October 17th, 2026 at 19:14 UTC. Verdict last changed: Saturday, October 17th. Official closures and current trail conditions take priority.

Modeled hourly. Closures and local conditions take priority.

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Is Sweetwater Reservoir rideable today?

Yes. The live verdict is DRY, rideable now. 0.2″ of rain, 5d ago.

CHANGED
Monday, October 12th at 9am
Dried back to DRY.
Sunday, October 11th at 6pm
Dried back to CAUTION.
Saturday, October 10th at 11pm
Rain moved in. Verdict dropped to STAY OFF.
Over the tracked history, Sweetwater Reservoir has been rideable on 8 of the last 10 days (very dry and dusty on 2 of them), under a caution advisory on 1, and too wet to ride on 1. Loam also considers soil, slope, tree cover, and drying time.

Soil and terrain at Sweetwater Reservoir

Sweetwater Reservoir is a mountain bike trail network in San Diego, CA. Soil data at the sampled location is classified as loam. Open tree cover can allow more sun and wind exposure, helping drying. Terrain data indicates an elevation of about 351 ft, an average terrain slope of 5.5° and a predominant WNW-facing aspect. Terrain slope does not measure the trail tread or its drainage features. Loam models conditions across the network; individual trails and constructed surfaces can differ from these environmental inputs. Official closures and conditions on the ground take priority.

How we check ourselves

How these factors affect drying

SoilLoam

Loam combines drainage with water retention. Soil type alone does not establish how long this network takes to dry. The model uses surveyed water-retention values, not measured trail recovery times.

CanopyOpen 0%

Open tree cover can allow more sunlight and wind to reach the ground. Terrain, weather and trail construction also affect drying.

TerrainModerate

Moderate terrain slope is one input to the drying model. Local drainage also depends on soil and trail construction.

FAQ

Can you ride Sweetwater Reservoir right now?

The current estimate for Sweetwater Reservoir is DRY: rideable. Rideable now. No significant rain in the forecast. 0.2″ of rain, 5d ago.

Is Sweetwater Reservoir muddy right now?

Loam currently estimates dry conditions (DRY). 0.2″ of rain, 5d ago.

What is the soil and trail surface like at Sweetwater Reservoir?

The soil data at the sampled location is classified as loam. This describes an environmental input, not a survey of every trail surface.

How long does Sweetwater Reservoir take to dry after rain?

Sweetwater Reservoir has no fixed drying time. Rainfall, soil moisture, shade and the weather that follows all matter. Check the current estimate and wait until the trail surface is firm.

Can you ride Sweetwater Reservoir after rain?

Drying time depends on how much rain fell and the weather that follows. Wait until the surface is firm. Check the current estimate before heading out, and turn back if your tires leave ruts.

What does a frozen condition mean at Sweetwater Reservoir?

FROZEN means Loam estimates snow cover or frozen ground. It does not establish that riding is allowed or that every trail is frozen. Check posted winter access rules and watch for soft ground as temperatures rise.

What's the terrain and elevation like at Sweetwater Reservoir?

Terrain data indicates an elevation of about 351 ft, an average terrain slope of 5.5° and a predominant WNW-facing aspect. Terrain slope does not measure the trail tread or its drainage features.

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Network profile

Network profile

Soil
Loamdrainage input
Terrain
Moderateterrain slope
Tree cover
0%Open
Elevation
351 ft
Average grade
5.5°
Predominant aspect
WNW-facing

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