Delta Happenings
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In this issue
EVENTS
NEWS
ONGOING
ROAD AND BRIDGE WORK
DELTA AGENCY MEETINGS
EVENTS
Upcoming events in the Delta include:
- Sip and stroll with mocktails, hors d'oeuvres, and an art activity at Big Break Regional Shoreline in Oakley on April 16
- Keep Antioch Beautiful at a volunteer cleanup on April 18.
- Interact with nature and wildlife at the family-oriented California Duck Days April 25 at Yolo Bypass Wildlife Area Headquarters in Davis.
Submit your Delta event for the calendar here.
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NEWS
Saturday: Explore Impact of Spanish Anza Expedition, 250 Years Later
 The Spanish Anza Expedition from Sonora, Mexico, to San Francisco (with a hard turn at the marshy Delta) turns 250 this year.
A symposium Saturday in Pittsburg explores the Anza expedition's impact on indigenous communities and California's East Bay through poetry, readings from diaries, talks from expedition descendants, and thoughtful discussion. The symposium includes a panel on how to teach about the expedition and Spanish colonialism, moderated by Delta Protection Commission Program Manager Blake Roberts.
Tickets are $23.18 for students and seniors, and $33.85 general admission, and include a boxed lunch for those who purchase by Wednesday, April 8.
Learn more about the expedition through California and Arizona at the Juan Bautista de Anza National Historic Trail website.
New: an Online Map of the Delta
The Delta Stewardship Council has unveiled an online Delta atlas to help people understand exactly where the Delta's boundaries are (shown above: a version showing the Delta and Suisun Marsh, with the Delta Primary Zone shaded in tan).
"The atlas is our first attempt to make select location data for the Delta more accessible to the public," wrote Council Environmental Program Manager Dan Constable. "We considered including a range of additional data sets, but have kept it focused for now to provide a more straightforward user interface."
Current map options include city and county boundaries, Census designated places, legacy communities, designated floodways, public conservation lands, and more.
Treatment of Aquatic Invasives in the Delta this Week
The State Division of Boating and Waterways will be applying aquatic invasive vegetation treatments this week at the following sites, subject to change based on regulatory requirements, weather conditions, plant growth and movement, waterway traffic, listed fish presence surveys, and other conditions:
Priority Floating Aquatic Vegetation Treatment Sites: 12, 31-35, 45-49, 59-63, 65, 72, 73, 75-77, 79, 87, 200, 203, 206, 215-217, 220-226, 262, 267, 268, 270, 272, 291
Backup Floating Aquatic VegetationTreatment Sites: 10-12, 18, 26, 28, 29, 37, 39-41, 44, 52, 80, 81, 84, 85, 108-112, 300-304
Here is the Delta Site map and the Southern Site map.
Submersed Aquatic Vegetation Treatment Sites (see map): 14.S, 15.S, 26.S, 32.C, 38.K, 74, 93.C, 93.M, 93.S, 97.B
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New: Bureau of Reclamation Bay-Delta Monitoring Webpage
The Bureau of Reclamation has launched a new project webpage that centralizes public access to its Bay-Delta flow and water quality monitoring data.
Data from monitoring stations are collected through routine manual downloads and posted online. As equipment becomes available, telemetry systems are being installed to allow real-time access to sensor readings through the California Data Exchange Center.
Read more or visit the site.
ONGOING
Delta Protection Commission Job: Sr. Environmental Planner - 4/20 Deadline
The Delta Protection Commission is hiring a Senior Environmental Planner with responsibilities that are key to the DPC’s mission: land use and levees.
This Senior Environmental Planner will perform planning, project development, and grants management; conduct analytical studies; formulate procedures and policies; make recommendations to the Executive Director on a broad spectrum of program-related issues that impact the Sacramento-San Joaquin Delta; and represent the Commission as assigned.
Applications close April 20.
Applications Open for Delta Protection Advisory Committee - 4/17 Deadline
Applications to fill five seats on the Delta Protection Advisory Committee are open through Friday, April 17.
The terms of five Committee seats expire in May 2026: Delta Organization (Mariah Looney), Delta Agriculture Seat 1 (Jeff Iniguez), Delta Recreation (vacant), State Agency (Edward Hard), Utilities-Related Infrastructure (Sam Garcia). Incumbents are eligible to reapply.
ROAD AND BRIDGE WORK
Route 4 Delta Pavement Improvement Project
Caltrans has a $22 million project to repair and upgrade nine miles of State Route 4 between the Old River Bridge east of Discovery Bay and South Whiskey Slough Road in Holt.
Overnight, one-way traffic control will be in place at various eastbound and westbound locations Sundays-Thursdays. Two 55-hour/weekend-long full highway closures will take place on dates to be announced.
The project is expected to be complete in February 2027. Learn more.
Caltrans Work on Old River Bridge on SR-4
Upgrades and repairs of the Old River Bridge on State Route 4, located at the San Joaquin/Contra Costa county line, east of Discovery Bay, will result in 24-hour one-way traffic controls through November. Learn more (PDF).
DELTA AGENCY MEETINGS
The 2026 schedule for the Delta Protection Commission's public bodies is here. The schedule includes meeting packets as they become available, and approved minutes.
April 7: Delta Protection Advisory Committee meets in Stockton. The agenda is posted here.
April 23: Delta Stewardship Council meets. The agenda will be posted here at least 10 days in advance.
May 21: Delta Protection Commission meets at 5 p.m. The agenda will be posted here at least 10 days in advance.
May 21-22: Delta Independent Science Board meets. The agenda will be posted here at least 10 days in advance.
May 27: The Sacramento-San Joaquin Delta Conservancy meets. The agenda will be posted here at least 10 days in advance.
June 24: Delta NHA Advisory Committee meets. The agenda will be posted here at least 10 days in advance.
Not sure which Delta agency is which? This fact sheet (PDF) explains the missions and roles of the Delta Protection Commission, the Sacramento-San Joaquin Delta Conservancy, and the Delta Stewardship Council.
Send us your Delta news, events, or photos:
submit@delta.ca.gov
The DPC is on social media:
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Delta Protection Commission
2101 Stone Blvd Suite 200, West Sacramento, CA 95691
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