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Why Black Diamond Open Space dries this way
Terrain & soilBlack Diamond Open Space (Seattle & Snoqualmie, WA) rides on gravelly loam soil that drains fast over terrain that holds water and dries slowly. Heavy tree cover holds the damp in, so it stays wet longer than the sky overhead would suggest. Loam reads that exact ground against live weather, rather than leaning on a regional forecast that can’t tell you what the dirt is doing. The SSE-facing aspect soaks up sun through the middle of the day, which speeds drying and opens the season earlier, and the gentle terrain, about a 2.1° average grade at 627 ft, drains slowly enough that low spots stay soft after a storm.
Network profile
- Soil
- Gravelly loamdrains fast
- Drainage
- Holds waterdries slowly
- Tree cover
- 75%Dense
- Elevation
- 627 ft
- Average grade
- 2.1°
- Predominant aspect
- SSE-facing
How these factors affect drying
SoilGravelly loam
About 20% of this ground is rock fragments, so water runs through it faster than the soil type alone suggests. It dries quicker than plain loam.
CanopyDense 75%
Heavy tree cover shades the soil and blocks wind, so these trails dry slowly and can hold morning damp even after dry days.
TerrainHolds water
Water tends to pool and linger here rather than running off, so the surface can stay damp well after the weather clears.
Around Black Diamond Open Space
Trail stewards
Trail work here is done by Evergreen Mountain Bike Alliance. Support your local builders.
FAQ
Common questionsCan you ride Black Diamond Open Space right now?
As of the latest update, Black Diamond Open Space is Rideable, very dry (DUSTY). Rideable, but very dry. Expect dust and loose corners. No measurable rain in the past week.
What is the soil and trail surface like at Black Diamond Open Space?
Black Diamond Open Space sits on gravelly loam soil that drains fast. About 20% of this ground is rock fragments, so water runs through it faster than the soil type alone suggests. It dries quicker than plain loam.
How long does Black Diamond Open Space take to dry after rain?
Black Diamond Open Space usually needs about a day or two to dry after meaningful rain. Its terrain holds water in low spots, which slows it. Heavy tree cover slows drying further.
Does Black Diamond Open Space get snow in winter?
Yes. At 627 ft, Black Diamond Open Space typically sees winter snow and freeze-thaw that can pause riding. Loam flags a FROZEN state when the ground is snow-covered or frozen, then clears it as things thaw and dry.
What's the terrain and elevation like at Black Diamond Open Space?
Black Diamond Open Space sits at roughly 627 feet, faces mostly SSE, and averages a 2.1° grade with about 75% tree cover. That makes it a sunny, fast-drying network, and the gentle grade means it leaves low spots soft after storms. Loam models this exact ground against live weather rather than using one regional forecast.
When is the best time of year to ride Black Diamond Open Space?
The reliable season at Black Diamond Open Space runs late spring through fall: at around 627 feet it holds real winter snowpack, and freeze-thaw makes the shoulder seasons hit or miss. Its sunny aspect helps it come back fast after storms. Loam flags FROZEN days and posts a live verdict, so the calendar never has to be the tiebreaker.