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Pliocene Ridge Junior-senior High School (Closed 2006)

1999 Ridge Rd.
North San Juan, CA 95960

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Pliocene Ridge Junior-senior High School serves 49 students in grades 7-12.

The student-teacher ratio of 25:1 was higher than the California state level of 21:1.

Minority enrollment was 16% of the student body (majority American Indian), which was lower than the California state average of 80% (majority Hispanic).

School Overview

Grades Offered

Grades 7-12

View Data

Distribution of Students By Grade Trends
Grade	Pliocene Ridge Junior-senior High School
7	8
8	12
9	7
10	7
11	9
12	6

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Total Students

49 students

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Total Students Trends Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School
2025	49
2024	49
2023	49
2022	49
2021	49
2020	49
2019	49
2018	49
2017	49
2016	49
2015	49
2005	11
2004	43
2003	49
2002	31
2001	37
2000	56
1999	52
1998	50
1997	48
1996	50
1995	46
1994	36
1993	29
1992	10
1991	5
1990	23
1989	42

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Total Classroom Teachers

2 teachers

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Total Classroom Teachers Trends Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School
2025	2
2024	2
2023	2
2022	2
2021	2
2020	2
2019	2
2018	2
2017	2
2016	2
2015	2
2005	2
2004	2
2003	3
2002	3
2001	5
2000	5
1999	5
1998	5
1997	5
1996	5
1995	5
1994	5
1993	3
1992	3
1991	3
1990	3
1989	4

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School Rankings

This School

State Level (CA)

Student-Teacher Ratio

25:1

21:1

View Data

Student-Teacher Ratio Comparison Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	25:1	21:1
2024	25:1	21:1
2023	25:1	22:1	17:1
2022	25:1	22:1	17:1
2021	25:1	22:1	16:1
2020	25:1	23:1	18:1
2019	25:1	23:1	18:1
2018	25:1	23:1	18:1
2017	25:1	23:1	18:1
2016	25:1	24:1	18:1
2015	25:1	24:1	17:1
2005	6:1	22:1	15:1
2004	22:1	22:1	16:1
2003	16:1	21:1	16:1
2002	10:1	21:1	16:1
2001	7:1	21:1	22:1
2000	11:1	22:1	16:1
1999	10:1	22:1	16:1
1998	10:1	22:1	17:1
1997	10:1	24:1	17:1
1996	10:1	25:1	18:1
1995	10:1	25:1	18:1
1994	8:1	25:1	17:1
1993	10:1	25:1	18:1
1992	3:1	24:1	16:1
1991	2:1	24:1	16:1
1990	8:1	24:1	15:1
1989	11:1	24:1	14:1

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American Indian

12%

View Data

American Indian Student Percentage Comparison Over Years (1999-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	12%	1%
2024	12%	1%
2023	12%	1%	3%
2022	12%	1%	2%
2020	12%	1%	3%
2019	12%	1%	3%
2018	12%	1%	2%
2017	12%	1%	2%
2016	12%	1%	2%
2015	12%	1%	2%
2005	9%	2%	3%
2004	14%	2%	2%
2003	12%	2%	3%
2002	17%	2%	4%
2001	11%	2%	4%
2000	5%	1%	2%
1999	2%	1%	1%

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Asian

n/a

12%

View Data

Asian Student Percentage Comparison Over Years (1993-2004)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2004	2%	12%	2%
2002	3%	11%	1%
2001	8%	11%	2%
2000	4%	11%	5%
1999	4%	11%	3%
1998	6%	11%	3%
1997	2%	11%	1%
1996	4%	11%	1%
1995	5%	11%	1%
1994	3%	11%	1%
1993	3%	11%	1%

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Hispanic

56%

View Data

Hispanic Student Percentage Comparison Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	4%	56%
2024	4%	56%
2023	4%	55%	14%
2022	4%	56%	16%
2021	4%	56%	15%
2020	4%	55%	14%
2019	4%	55%	14%
2018	4%	54%	14%
2017	4%	54%	14%
2016	4%	54%	14%
2015	4%	54%	14%
2004	12%	46%	10%
2003	4%	45%	7%
2002	3%	44%	7%
2000	4%	42%	16%
1997	6%	40%	7%
1996	8%	39%	7%
1995	2%	38%	6%
1989	5%	31%	5%

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Black

n/a

View Data

Black Student Percentage Comparison Over Years (1997-2001)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2001	3%	8%	5%
2000	4%	9%	6%
1999	2%	9%	1%
1998	4%	9%	1%
1997	2%	9%

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White

84%

20%

View Data

White Student Percentage Comparison Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	84%	20%
2024	84%	20%
2023	84%	21%	76%
2022	84%	21%	75%
2021	84%	22%	76%
2020	84%	23%	72%
2019	84%	23%	72%
2018	84%	24%	81%
2017	84%	24%	81%
2016	84%	24%	80%
2015	84%	24%	79%
2005	91%	31%	84%
2004	72%	32%	85%
2003	84%	34%	87%
2002	77%	35%	87%
2001	78%	36%	65%
2000	83%	37%	71%
1999	92%	38%	90%
1998	90%	39%	86%
1997	90%	39%	90%
1996	86%	40%	91%
1995	93%	41%	91%
1994	97%	42%	91%
1993	97%	43%	92%
1992	100%	44%	92%
1991	100%	45%	91%
1990	100%	47%	92%
1989	95%	49%	93%

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Hawaiian

n/a

Two or more races

n/a

All Ethnic Groups

0.28

0.63

View Data

Diversity Score Comparison Over Years (1989-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	0.28	0.63
2024	0.28	0.63
2023	0.28	0.64	0.40
2022	0.28	0.63	0.42
2021	0.28	0.62	0.40
2020	0.28	0.63	0.45
2019	0.28	0.63	0.45
2018	0.28	0.64	0.33
2017	0.28	0.64	0.33
2016	0.28	0.64	0.35
2015	0.28	0.64	0.36
2005	0.17	0.67	0.27
2004	0.45	0.67	0.28
2003	0.28	0.67	0.24
2002	0.38	0.67	0.23
2001	0.38	0.67	0.52
2000	0.30	0.67	0.47
1999	0.15	0.67	0.18
1998	0.19	0.67	0.25
1997	0.19	0.67	0.19
1996	0.25	0.67	0.17
1995	0.13	0.67	0.17
1994	0.06	0.67	0.17
1993	0.06	0.67	0.14
1989	0.10	0.65	0.14

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Eligible for

41%

54%

View Data

Free Lunch Eligibility Comparison Over Years (1995-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	41%	54%
2024	41%	54%
2023	41%	51%	34%
2022	41%	51%	37%
2021	41%	53%	40%
2020	41%	52%	39%
2019	41%	52%	39%
2018	40%	49%	29%
2017	40%	49%	29%
2016	40%	50%	30%
2015	40%	50%	30%
2005	45%	40%	24%
2004	42%	40%	24%
2003	41%	39%	25%
2001	49%	39%	8%
2000	57%	40%	6%
1999	15%	40%	4%
1998	66%	47%	19%
1997	50%	47%	39%
1996	30%	46%	32%
1995	46%	45%	35%

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Eligible for

20%

View Data

Reduced-Price Lunch Eligibility Comparison Over Years (1999-2025)
Year	Pliocene Ridge Junior-senior High School	California	Sierra-Plumas Joint Unified School District
2025	20%	8%
2024	20%	8%
2023	20%	8%	5%
2022	20%	7%	5%
2021	20%	6%	5%
2020	20%	7%	6%
2019	20%	7%	6%
2018	20%	9%	9%
2017	20%	9%	9%
2016	20%	9%	10%
2015	20%	9%	11%
2005	27%	9%	11%
2004	9%	9%	9%
2003	20%	9%	14%
2001	24%	8%	5%
2000	11%	7%	2%
1999	8%	7%	2%

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School Statewide Testing

View Education Department Test Scores

School District Name

Sierra-Plumas Joint Unified School District

Source: National Center for Education Statistics (NCES), CA Dept. of Education

Frequently Asked Questions

How many students attend Pliocene Ridge Junior-senior High School?

49 students attend Pliocene Ridge Junior-senior High School.

What is the racial composition of the student body?

84% of Pliocene Ridge Junior-senior High School students are White, 12% of students are American Indian, and 4% of students are Hispanic.

What is the student-teacher ratio of Pliocene Ridge Junior-senior High School?

Pliocene Ridge Junior-senior High School has a student ration of 25:1, which is higher than the California state average of 21:1.

What grades does Pliocene Ridge Junior-senior High School offer ?

Pliocene Ridge Junior-senior High School offers enrollment in grades 7-12

What school district is Pliocene Ridge Junior-senior High School part of?

Pliocene Ridge Junior-senior High School is part of Sierra-Plumas Joint Unified School District.

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