Workforce Housing Done Wrong

Missouri Gulch Obstacles

There were actually two separate Missouri Gulch decisions placed before the Board on September 15, 2026:

1. Approve the land-use entitlement and environmental findings for the 80-unit housing development.

2. Authorize the County to apply for—and accept if awarded—a $27.5 million Transformative Climate Communities grant.

The Board was not being told that every obstacle had already been resolved. It was being asked to find that the identified impacts could be handled through conditions, later engineering, and mitigation.

Principal obstacles identified

Obstacle	What the Board was being asked to accept
Existing zoning prohibits the project	Rezone approximately 3.3 acres from Single-Family Residential/Professional Office to Multi-Family Residential and amend the General Plan/Mariposa Town Plan map.
Firefighting and building height	The original proposal requested five buildings up to 45 feet, although the normal maximum is 35 feet. County Fire expressed concern that its available equipment could not adequately fight a fire in buildings exceeding 35 feet. Immediately before the Board hearing, the applicant reduced the request to 37 feet.
Insufficient on-site parking	County standards indicated 156 spaces; the original project proposed only 87. The Planning Commission identified spillover parking, pedestrian crossing, neighborhood-street parking, and private-property parking as safety problems. The applicant then withdrew the request for 87 spaces and offered 116 spaces, described as the state-law parking requirement.
Emergency access	One 26-foot primary driveway and a narrower emergency-vehicle/pedestrian access were proposed. Final emergency ingress, egress, road grades, turning radii, gates, hydrants, fire connections, water supply and signage still require County Fire approval.
Wildfire exposure	The property is in the SRA and an area classified as high fire hazard. The Board was being asked to accept the finding that the risk could be reduced below significance through sprinklers, fire-resistant construction, defensible space, vegetation management, emergency water and compliance with PRC §§4290 and 4291.
Jones Street improvements	The project is estimated to generate approximately 599 average daily trips. The precise frontage, driveway, sidewalk, utility and roadway improvements were not completely established; Public Works is to determine them during final design.
Drainage and Missouri Gulch	The existing drainage channel must be avoided. The project proposes underground detention basins, but final hydraulic calculations, off-site conveyance improvements, percolation testing and possibly state stormwater permits remain outstanding.
Water and sewer	Final MPUD water, sewer and easement plans have not yet been approved. The developer must design and install required improvements, generally at its expense, and pay for an MPUD-approved independent inspector.
Sensitive terrain and mature trees	The site includes steep terrain, forested areas and mature oaks. The taller buildings and compact footprint were justified partly as necessary to avoid spreading development into these areas. Tree surveys, avoidance and replacement may be required.
Biological resources	Preconstruction surveys and protection measures may be required for nesting birds, bats, sensitive plants, milkweed/monarch habitat, oak trees and potentially jurisdictional waters.
Cultural and tribal resources	Work must stop if archaeological, tribal cultural resources or human remains are discovered. The Board was asked to accept these procedures as adequate mitigation.
Noise and aesthetics	Construction hours, dark-sky lighting, landscaping, building colors and final architectural details are controlled through conditions, many of which remain subject to later staff approval.
Lot configuration and easements	A lot-line adjustment and certificate of compliance must be recorded before building permits. Cross-access and utility easements are required if the parcels remain separately transferable.
Affordability requirements	At least 16 of the 80 units must be income-restricted, averaging approximately 50% of area median income, with a recorded 55-year restriction. Final affordability levels and unit mix remain dependent on financing.
Ownership and site control	Community HousingWorks proposes to buy the 9.7-acre Missouri Gulch property from Yosemite Conservancy and acquire the separate Bullion Street parking parcel. The grant proposal says a purchase agreement exists for Missouri Gulch, while negotiations for the parking property were still being finalized.
Incomplete construction financing	The proposed $27.5 million TCC grant package includes approximately $18.48 million for Missouri Gulch housing, utilities and sidewalks, but the County expressly states that this does not fully fund the 80-unit development. Community HousingWorks must obtain additional loans and funding.
Grant uncertainty and deadline	The grant is competitive and not guaranteed. Land-use approval was needed before the September 30, 2026 application deadline. Staff warned that delaying the entitlement decision could prevent the grant application.

These matters appear in the amended Board staff report, September 15 amended resolution, and CEQA Initial Study.

Environmental finding the Board was asked to make

The environmental study identified potentially significant effects in seven categories:

• Aesthetics

• Biological resources

• Cultural resources

• Hazards and hazardous materials, principally wildfire exposure

• Noise

• Tribal cultural resources

• Wildfire

The proposed finding was not that these dangers do not exist. It was:

With the specified mitigation measures and continuing monitoring, each potentially significant effect can be reduced to a less-than-significant level.

By adopting the Mitigated Negative Declaration, the Board would accept that conclusion and determine that a full Environmental Impact Report was unnecessary.

What changed just before the Board hearing

The posted “Resolution Amended as of 09/15/26” says that on September 14 the applicant:

• Withdrew the request to reduce parking to 87 spaces;

• Agreed to provide 116 spaces under the state-law standard; and

• Reduced the requested building height from 45 feet to 37 feet.

This appears to have been the compromise intended to answer the Planning Commission’s two strongest objections: inadequate firefighting capability and insufficient parking.

However, the TCC project description still describes approximately 87 on-site spaces and acquisition of the Bullion Street property for additional parking. That creates an important question: Does the current grant budget and site plan actually accommodate the newly promised 116 spaces, and at what added cost?

What the separate $27.5 million grant vote committed the County to

The separate resolution asked the Board to:

• Approve filing the $27.5 million TCC application;

• Accept the grant if awarded;

• Certify that the County and its partners would have sufficient resources to execute the proposed projects;

• Continue the collaborative Governance Council;

• Authorize the Development Services Director or designee to negotiate and execute applications, agreements, payment requests and related documents.

The grant package includes housing, land acquisition, utilities, sidewalks, YARTS improvements, shared vehicles, recreation and other community projects. TCC project descriptions and budgets and TCC authorizing resolution.

Bottom line

The most consequential unresolved obstacles are:

1. Whether 116 parking spaces physically and financially fit the revised project.

2. Whether 37-foot, three-story buildings can be adequately served by County Fire.

3. Whether the emergency-access configuration is sufficient.

4. The cost and capacity of MPUD water and sewer improvements.

5. Final drainage and Jones Street improvements.

6. Acquisition of the land and proposed off-site parking property.

7. Obtaining the remaining construction financing beyond the requested grant.

8. Who ultimately carries financial responsibility if costs exceed the grant and private financing?

The land-use approval does not itself obligate the County to construct or finance the apartments. The separate grant resolution, however, is more consequential because it asks the County to serve as lead applicant, accept the award, certify sufficient implementation resources and authorize later grant documents.

Missouri Gulch Storm Water Plan

The proposed drainage concept is:

1. Rain falling on roofs, parking lots and internal roads would enter the project’s storm-drain system.

2. Runoff would be routed into as many as five underground detention basins.

3. The basins would temporarily store runoff and release it into the existing County drainage system at approximately the site’s existing—predevelopment—runoff rate.

4. The natural drainage called Missouri Gulch would remain open. The proposal states that buildings and grading would remain outside its top-of-bank, with no construction in the channel bed or banks.

5. Roof gutters would connect to the storm-drain system, while grading would direct surface water away from buildings.

6. Construction would require erosion controls, a Stormwater Pollution Prevention Plan and potentially an NPDES construction permit.

These elements appear in the [official Initial Study/Mitigated Negative Declaration](https://mariposacoca.api.civicclerk.com/v1/Meetings/GetAttachmentFile(fileId=12230) and the [Board staff report](https://mariposacoca.api.civicclerk.com/v1/Meetings/GetAttachmentFile(fileId=12287).

FEMA 100-year-flood map

(Download the map)

The map shows:

• The project boundary in red.

• The proposed development area in black hatching.

• The FEMA-mapped 1%-annual-chance floodplain in blue.

• The mapped floodplain is approximately 0.3 mile southwest of the development area, principally along Mariposa Creek.

• The project property itself is not shown inside FEMA’s mapped 100-year floodplain.

A “100-year flood” means a flood with a 1% probability in any year—not one that occurs only once every century. Inside such a floodplain, the cumulative probability is approximately 26% over 30 years. FEMA’s flood-zone explanation

My preliminary flood-risk estimate

Source of flooding	Preliminary risk assessment
FEMA-mapped Mariposa Creek flooding	Low mapped exposure. The project is outside the mapped 1%-annual-chance floodplain and approximately 0.3 mile from it.
Missouri Gulch flash flow	Unquantified, potentially meaningful localized risk. The ephemeral channel passes through the property and under Jones and Bullion Streets through culverts.
Runoff created by roofs and pavement	Intended to be controlled, but final basin sizes, outlet rates and calculations have not yet been publicly established.
Culvert obstruction or inadequate capacity	Not adequately quantified in the documents reviewed. Debris, sediment or undersized culverts could cause water to back up outside the FEMA floodplain.
Underground-basin infiltration	Still subject to testing. The conditions require percolation testing before the grading permit.

The most defensible conclusion is:

The site has low exposure to the currently mapped Mariposa Creek 100-year floodplain, but the documents do not yet demonstrate the project’s safety during a 100-year storm occurring within the Missouri Gulch drainage itself. We have had 2 in the last 10 years.

A FEMA map can omit small drainages, shallow flooding and localized culvert-backup conditions. Therefore, “outside the FEMA floodplain” does not establish that the project has no flash-flood or drainage risk.

What Remains Unresolved

Condition 30 of the Board resolution requires the developer to prepare a final storm water and drainage design addressing:

• On-site hydraulics;

• Adequate storm water detention;

• Necessary off-site improvements;

• Conveyance into the public drainage system;

• Public Works approval; and

• Possible Caltrans review.

It references only a preliminary grading and drainage plan dated June 18, 2026. The public documents reviewed do not provide:

• The 100-year peak flow through Missouri Gulch, in cubic feet per second;

• The upstream drainage-basin acreage;

• Modeled 100-year water-surface elevations;

• Required freeboard between floodwater and apartment floors;

• Jones Street and Bullion Street culvert capacities;

• Detention-basin dimensions or total storage volume;

• Emergency overflow routes if the underground system fills or becomes blocked;

• A clear design-storm standard for the phrase “release runoff at existing rates”; or

• A hydraulic analysis accounting for debris following the French Fire.

There is another important issue: the referenced drainage plan predates the last-minute increase to 116 parking spaces. More pavement normally means more impervious surface and faster runoff. The final drainage analysis should therefore be based upon the final 116-space site plan, not the earlier approximately 87–90-space configuration.

Before grading, the County should require a sealed hydrology report demonstrating that the final project can safely convey at least the 100-year storm without flooding buildings, Jones Street, neighboring property or emergency access—and showing what happens if a culvert or underground basin outlet is obstructed.