California State Parks is alerting the public that the Central Valley Regional Water Quality Control Board (RWQCB) has identified elevated levels of E. coli bacteria at Willow Creek Day Use Area, Nimbus Flats and Black Miners Bar Day Use Beach within Folsom Lake State Recreation Area. Samples collected in late June indicate higher levels of the bacteria present at near-shore locations. E. coli is a bacterium found in the intestines of warm-blooded animals and serves as an indicator of fecal pollution in the water. While most E. coli strains are harmless and present at low levels in most waterbodies, it is essential to be cautious when concentration levels are elevated.
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RWQCB and State Parks are also monitoring for cyanobacteria (formerly known as blue-green algae) and nuisance algae in freshwater and estuarine waterbodies. If these occur at levels that pose a risk to humans, animals and the environment, they are referred to as freshwater harmful algal blooms, also known as HABs.
Given the elevated E. Coli testing levels at Lake Natoma and the potential for HABs on Folsom Lake, the public is advised to follow these safety tips:
Do not drink from any waterbody.
Keep an eye on pets and wash them with clean water after lake or river play. Provide clean drinking water. Dogs are especially susceptible to cyanobacteria because they may intentionally eat algae clumps or drink large amounts of water, exposing them to potentially fatal toxins.
Avoid swimming with open wounds.
Shower after going in lakes or rivers.
To reduce your risk of exposure, please refer to the Centers for Disease Control and Prevention’s Healthy Swimming Habits.
Additional E. Coli testing will continue throughout the summer to monitor the water quality. Weekly test results are available on the SWAMP Recreational Water Quality Monitoring webpage.
Current advisories regarding Harmful Algal Blooms (cyanobacteria) can be found on the Water Quality Monitoring Council webpage.
Posted Wednesday, July 01, 2026
Peninsula Campground Seasonal Fire Restrictions
Effective June 10, 2026 camp fires, cooking devices fueled by wood or charcoal and liquid fuel torches are prohibited at the Peninsula Campground for the remainder of the 2026 fire season. Portable cooking devices and portable campfires fueled by pressurized liquid fuel are permitted for use by registered campers in designated campsites.
This order is in effect due to dry conditions and the remote nature of the Peninsula Campground.
Posted Monday, June 08, 2026
Peninsula Campground Renumbering
Peninsula Campground is open April 1 st -September 30th, 2026.
Folsom Lake SRA has made some modifications to the Peninsula Campground resulting in the renumbering of the campsites. The revised Peninsula Campground map has reflects the renumbered campsites. Below is a list of the old campsite numbers on the left and new numbers on the right.
Old Campsite Number
New Campsite Number
2
1
3
2
4
3
5
4
6
5
7
6
8
7
9
8
10
9
11
10
12
11
13
12
14
13
15
14
16
15
18
16
19
17
20
19
21
18
22
20
23
21
24
22
25
23
26
24
27
25
28
26
29
27
30
28
31
31
32
32
32A
29
33
30
34
33
35
34
36
35
37
36
38
37
39
38
40
39
42
40
43
41
44
89
45
85
46
84
47
83
48
82
49
81
50
80
51
79
52
78
53
77
56
76
58
42
59
43
60
40
61
75
62
45
63
74
64
46
65
73
66
47
67
48
68
49
69
50
70
72
71
51
74
52
75
53
76
54
77
55
78
56
79
57
80
58
81
59
82
60
83
61
84
62
85
63
86
64
87
65
89
66
92
67
93
68
94
69
95
70
96
71
Posted Friday, April 03, 2026
North Granite Closure
Effective April 3, 2026, North Granite Bay will be closed Saturdays, Sundays, and Holidays.
Posted Friday, April 03, 2026
Closure of Mormon Island Auxiliary Dam Area- Updated April 10, 2024
Effective April 10, 2024 the Mormon Island Auxiliary Dam (MIAD) is closed to public access due to the Folsom Dam Raise Project.
The closure area now includes all areas between the Sophia Parkway access road on the east to Folsom Point on the west and all areas between Green Valley Road and the main body of Folsom Lake.
There is no trail access or alternate route within Folsom Lake State Recreation Area. The Posted Order with map of the closure area can be found here. Additional information regarding this project can be found at: https://www.spk.usace.army.mil/Missions/Civil-Works/Folsom-Dam-Raise/.
Posted Tuesday, November 26, 2024