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United States
California
Sonoma County
Santa Rosa

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Pythian Rd

Routes
Running trails & routes
United States
California
Sonoma County
Santa Rosa

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Pythian Rd

Hard

3.1

(1)

53

runners

Lake Ilsanjo – Warren Richardson Trail loop from Hwy 12 & Pythian Rd

03:08

27.8km

300m

Running

Hard run. Very good fitness required. Mostly paved surfaces. Suitable for all skill levels. The starting point of the route is right next to a parking lot.

Last updated: August 20, 2026

Waypoints

A

Start point

Parking

Get Directions
1

9.21 km

Swimming Beach

Highlight • Beach

Great free swimming beach (if you walk or bike into Spring Lake Park).
Pleasant beach cafe and snack shack.
Given the number of geese and kids the water quality is probably better early in the season.

Tip by

2

9.90 km

Spring Lake Park

Highlight • Lake

Leafy park along the west shore of the large Santa Rosa Creek Reservoir, with good running trails around the water and through the meadows and shaded groves

Tip by

3

15.8 km

Lake Ilsanjo

Highlight • Lake

Lake Ilsanjo is a small quiet lake near the top of Canyon trail. A hidden gem for a break or a swim. It is much quieter than Santa Rosa Reservoir …

Tip by

4

16.1 km

Lake Ilsanjo

Highlight • Lake

Very pretty lake in the middle of Annadel State Park, great for a swim on a hot day. Access is best from Lake Trail with a small beach on the north-west side.

Tip by

5

17.2 km

Warren Richardson Trail

Highlight (Segment) • Trail

The Warren Richardson Trail is a gravel and dirt path that begins at the main entrance on the eastern side of the park. It ascends to the summit of the …

Tip by

6

17.5 km

Get off the wide forest road onto the quieter hiking trails

Tip by

7

18.1 km

Steve's S Trail

Highlight (Segment) • Trail

Hiking trail to get off the wide forest road

Tip by

8

18.9 km

Water Tank Trail

Highlight • Trail

Short, useful connector trail

Tip by

B

27.8 km

End point

Parking

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Way Types & Surfaces

Way Types

16.7 km

7.44 km

1.90 km

1.41 km

307 m

< 100 m

Surfaces

13.0 km

4.75 km

4.24 km

2.50 km

2.16 km

1.17 km

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Elevation

Elevation
Nothing selected – click and drag below to see the stats for a specific part of the route.

Highest point (290 m)

Lowest point (80 m)

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Weather

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Today

Wednesday 21 October

21°C

11°C

23 %

Additional weather tips

Max wind speed: 11.0 km/h

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Our route recommendations are based on thousands of hikes, rides, and runs completed by other people on komoot.

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